Detect invalid package locales and warn the user

src/Tasks/Common/Resources/Strings.resx

@@ -851,4 +851,12 @@ You may need to build the project on another operating system or architecture, o
     <value>NETSDK1186: This project depends on Maui Essentials through a project or NuGet package reference, but doesn't declare that dependency explicitly. To build this project, you must set the UseMauiEssentials property to true (and install the Maui workload if necessary).</value>
     <comment>{StrBegin="NETSDK1186: "}</comment>
   </data>
+  <data name="PackageContainsIncorrectlyCasedLocale" xml:space="preserve">
+    <value>NETSDK1187: Package {0} {1} has a resource with the locale '{2}'. This locale has been normalized to the standard format '{3}' to prevent casing issues in the build. Consider notifying the package author about this casing issue.</value>
+    <comment>Error code is NETSDK1187. 0 is a package name, 1 is a package version, 2 is the incorrect locale string, and 3 is the correct locale string.</comment>
+  </data>
+  <data name="PackageContainsUnknownLocale" xml:space="preserve">
+    <value>NETSDK1188: Package {0} {1} has a resource with the locale '{2}'. This locale is not recognized by .NET. Consider notifying the package author that it appears to be using an invalid locale.</value>
+    <comment>Error code is NETSDK1188. 0 is a package name, 1 is a package version, and 2 is the incorrect locale string</comment>
+  </data>
 </root>

src/Tasks/Common/Resources/xlf/Strings.cs.xlf

@@ -650,6 +650,16 @@ The following are names of parameters or literal values and should not be transl
         <target state="translated">NETSDK1146: PackAsTool nepodporuje nastavení TargetPlatformIdentifier. Například TargetFramework nemůže být net5.0-windows, jedině net5.0. PackAsTool zároveň nepodporuje UseWPF ani UseWindowsForms při cílení na rozhraní .NET 5 nebo vyšší.</target>
         <note>{StrBegin="NETSDK1146: "}</note>
       </trans-unit>
+      <trans-unit id="PackageContainsIncorrectlyCasedLocale">
+        <source>NETSDK1187: Package {0} {1} has a resource with the locale '{2}'. This locale has been normalized to the standard format '{3}' to prevent casing issues in the build. Consider notifying the package author about this casing issue.</source>
+        <target state="new">NETSDK1187: Package {0} {1} has a resource with the locale '{2}'. This locale has been normalized to the standard format '{3}' to prevent casing issues in the build. Consider notifying the package author about this casing issue.</target>
+        <note>Error code is NETSDK1187. 0 is a package name, 1 is a package version, 2 is the incorrect locale string, and 3 is the correct locale string.</note>
+      </trans-unit>
+      <trans-unit id="PackageContainsUnknownLocale">
+        <source>NETSDK1188: Package {0} {1} has a resource with the locale '{2}'. This locale is not recognized by .NET. Consider notifying the package author that it appears to be using an invalid locale.</source>
+        <target state="new">NETSDK1188: Package {0} {1} has a resource with the locale '{2}'. This locale is not recognized by .NET. Consider notifying the package author that it appears to be using an invalid locale.</target>
+        <note>Error code is NETSDK1188. 0 is a package name, 1 is a package version, and 2 is the incorrect locale string</note>
+      </trans-unit>
       <trans-unit id="PackageNotFound">
         <source>NETSDK1064: Package {0}, version {1} was not found. It might have been deleted since NuGet restore. Otherwise, NuGet restore might have only partially completed, which might have been due to maximum path length restrictions.</source>
         <target state="translated">NETSDK1064: Balíček {0} verze {1} se nenašel. Je možné, že se od obnovení NuGet odstranil. Jinak je možné, že obnovení NuGet se provedlo jenom částečně, důvodem mohla být omezení pro maximální délku cesty.</target>

src/Tasks/Common/Resources/xlf/Strings.de.xlf

@@ -650,6 +650,16 @@ The following are names of parameters or literal values and should not be transl
         <target state="translated">NETSDK1146: Die Festlegung von TargetPlatformIdentifier wird von PackAsTool nicht unterstützt. Beispielsweise kann nicht "net5.0-windows", sondern nur "net5.0" als TargetFramework verwendet werden. Bei Festlegung von .NET 5 oder höher als Ziel werden auch UseWPF oder UseWindowsForms von PackAsTool nicht unterstützt.</target>
         <note>{StrBegin="NETSDK1146: "}</note>
       </trans-unit>
+      <trans-unit id="PackageContainsIncorrectlyCasedLocale">
+        <source>NETSDK1187: Package {0} {1} has a resource with the locale '{2}'. This locale has been normalized to the standard format '{3}' to prevent casing issues in the build. Consider notifying the package author about this casing issue.</source>
+        <target state="new">NETSDK1187: Package {0} {1} has a resource with the locale '{2}'. This locale has been normalized to the standard format '{3}' to prevent casing issues in the build. Consider notifying the package author about this casing issue.</target>
+        <note>Error code is NETSDK1187. 0 is a package name, 1 is a package version, 2 is the incorrect locale string, and 3 is the correct locale string.</note>
+      </trans-unit>
+      <trans-unit id="PackageContainsUnknownLocale">
+        <source>NETSDK1188: Package {0} {1} has a resource with the locale '{2}'. This locale is not recognized by .NET. Consider notifying the package author that it appears to be using an invalid locale.</source>
+        <target state="new">NETSDK1188: Package {0} {1} has a resource with the locale '{2}'. This locale is not recognized by .NET. Consider notifying the package author that it appears to be using an invalid locale.</target>
+        <note>Error code is NETSDK1188. 0 is a package name, 1 is a package version, and 2 is the incorrect locale string</note>
+      </trans-unit>
       <trans-unit id="PackageNotFound">
         <source>NETSDK1064: Package {0}, version {1} was not found. It might have been deleted since NuGet restore. Otherwise, NuGet restore might have only partially completed, which might have been due to maximum path length restrictions.</source>
         <target state="translated">NETSDK1064: Das Paket "{0}", Version {1}, wurde nicht gefunden. Möglicherweise wurde es nach der NuGet-Wiederherstellung gelöscht. Andernfalls wurde die NuGet-Wiederherstellung aufgrund von Beschränkungen der maximalen Pfadlänge eventuell nur teilweise abgeschlossen.</target>

src/Tasks/Common/Resources/xlf/Strings.es.xlf

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.2" xsi:schemaLocation="urn:oasis:names:tc:xliff:document:1.2 xliff-core-1.2-transitional.xsd">
   <file datatype="xml" source-language="en" target-language="es" original="../Strings.resx">
     <body>
@@ -650,6 +650,16 @@ The following are names of parameters or literal values and should not be transl
         <target state="translated">NETSDK1146: PackAsTool no admite que se establezca el valor TargetPlatformIdentifier. Por ejemplo, TargetFramework no puede ser net5.0-windows, solo net5.0. Además, PackAsTool tampoco admite UseWPF ni UseWindowsForms cuando se destina a .NET 5 y versiones posteriores.</target>
         <note>{StrBegin="NETSDK1146: "}</note>
       </trans-unit>
+      <trans-unit id="PackageContainsIncorrectlyCasedLocale">
+        <source>NETSDK1187: Package {0} {1} has a resource with the locale '{2}'. This locale has been normalized to the standard format '{3}' to prevent casing issues in the build. Consider notifying the package author about this casing issue.</source>
+        <target state="new">NETSDK1187: Package {0} {1} has a resource with the locale '{2}'. This locale has been normalized to the standard format '{3}' to prevent casing issues in the build. Consider notifying the package author about this casing issue.</target>
+        <note>Error code is NETSDK1187. 0 is a package name, 1 is a package version, 2 is the incorrect locale string, and 3 is the correct locale string.</note>
+      </trans-unit>
+      <trans-unit id="PackageContainsUnknownLocale">
+        <source>NETSDK1188: Package {0} {1} has a resource with the locale '{2}'. This locale is not recognized by .NET. Consider notifying the package author that it appears to be using an invalid locale.</source>
+        <target state="new">NETSDK1188: Package {0} {1} has a resource with the locale '{2}'. This locale is not recognized by .NET. Consider notifying the package author that it appears to be using an invalid locale.</target>
+        <note>Error code is NETSDK1188. 0 is a package name, 1 is a package version, and 2 is the incorrect locale string</note>
+      </trans-unit>
       <trans-unit id="PackageNotFound">
         <source>NETSDK1064: Package {0}, version {1} was not found. It might have been deleted since NuGet restore. Otherwise, NuGet restore might have only partially completed, which might have been due to maximum path length restrictions.</source>
         <target state="translated">NETSDK1064: No se encontró el paquete {0}, versión {1}. Es posible que se haya eliminado desde la restauración de NuGet. De lo contrario, la restauración de NuGet podría haberse completado solo parcialmente, lo que puede deberse a las restricciones de longitud de ruta máxima.</target>

src/Tasks/Common/Resources/xlf/Strings.fr.xlf

@@ -650,6 +650,16 @@ The following are names of parameters or literal values and should not be transl
         <target state="translated">NETSDK1146: PackAsTool ne prend pas en charge la définition de TargetPlatformIdentifier. Par exemple, TargetFramework ne peut pas être net5.0-Windows, uniquement net5.0. PackAsTool ne prend pas non plus en charge UseWPF ni UseWindowsForms quand vous ciblez .NET 5 et ultérieur.</target>
         <note>{StrBegin="NETSDK1146: "}</note>
       </trans-unit>
+      <trans-unit id="PackageContainsIncorrectlyCasedLocale">
+        <source>NETSDK1187: Package {0} {1} has a resource with the locale '{2}'. This locale has been normalized to the standard format '{3}' to prevent casing issues in the build. Consider notifying the package author about this casing issue.</source>
+        <target state="new">NETSDK1187: Package {0} {1} has a resource with the locale '{2}'. This locale has been normalized to the standard format '{3}' to prevent casing issues in the build. Consider notifying the package author about this casing issue.</target>
+        <note>Error code is NETSDK1187. 0 is a package name, 1 is a package version, 2 is the incorrect locale string, and 3 is the correct locale string.</note>
+      </trans-unit>
+      <trans-unit id="PackageContainsUnknownLocale">
+        <source>NETSDK1188: Package {0} {1} has a resource with the locale '{2}'. This locale is not recognized by .NET. Consider notifying the package author that it appears to be using an invalid locale.</source>
+        <target state="new">NETSDK1188: Package {0} {1} has a resource with the locale '{2}'. This locale is not recognized by .NET. Consider notifying the package author that it appears to be using an invalid locale.</target>
+        <note>Error code is NETSDK1188. 0 is a package name, 1 is a package version, and 2 is the incorrect locale string</note>
+      </trans-unit>
       <trans-unit id="PackageNotFound">
         <source>NETSDK1064: Package {0}, version {1} was not found. It might have been deleted since NuGet restore. Otherwise, NuGet restore might have only partially completed, which might have been due to maximum path length restrictions.</source>
         <target state="translated">NETSDK1064: Le package {0}, version {1}, est introuvable. Il a peut-être été supprimé depuis la restauration NuGet. Sinon, la restauration NuGet a peut-être été partiellement effectuée en raison de restrictions appliquées à la longueur maximale du chemin.</target>

src/Tasks/Common/Resources/xlf/Strings.it.xlf

@@ -650,6 +650,16 @@ The following are names of parameters or literal values and should not be transl
         <target state="translated">NETSDK1146: PackAsTool non supporta l'impostazione di TargetPlatformIdentifier. Ad esempio, TargetFramework non può essere essere impostato su net5.0-windows, ma solo su net5.0. PackAsTool non supporta neanche UseWPF o UseWindowsForms quando la destinazione è .NET 5 e versioni successive.</target>
         <note>{StrBegin="NETSDK1146: "}</note>
       </trans-unit>
+      <trans-unit id="PackageContainsIncorrectlyCasedLocale">
+        <source>NETSDK1187: Package {0} {1} has a resource with the locale '{2}'. This locale has been normalized to the standard format '{3}' to prevent casing issues in the build. Consider notifying the package author about this casing issue.</source>
+        <target state="new">NETSDK1187: Package {0} {1} has a resource with the locale '{2}'. This locale has been normalized to the standard format '{3}' to prevent casing issues in the build. Consider notifying the package author about this casing issue.</target>
+        <note>Error code is NETSDK1187. 0 is a package name, 1 is a package version, 2 is the incorrect locale string, and 3 is the correct locale string.</note>
+      </trans-unit>
+      <trans-unit id="PackageContainsUnknownLocale">
+        <source>NETSDK1188: Package {0} {1} has a resource with the locale '{2}'. This locale is not recognized by .NET. Consider notifying the package author that it appears to be using an invalid locale.</source>
+        <target state="new">NETSDK1188: Package {0} {1} has a resource with the locale '{2}'. This locale is not recognized by .NET. Consider notifying the package author that it appears to be using an invalid locale.</target>
+        <note>Error code is NETSDK1188. 0 is a package name, 1 is a package version, and 2 is the incorrect locale string</note>
+      </trans-unit>
       <trans-unit id="PackageNotFound">
         <source>NETSDK1064: Package {0}, version {1} was not found. It might have been deleted since NuGet restore. Otherwise, NuGet restore might have only partially completed, which might have been due to maximum path length restrictions.</source>
         <target state="translated">NETSDK1064: il pacchetto {0} versione {1} non è stato trovato. Potrebbe essere stato eliminato dopo il ripristino di NuGet. In caso contrario, il ripristino di NuGet potrebbe essere stato completato solo parzialmente, a causa delle restrizioni relative alla lunghezza massima del percorso.</target>

src/Tasks/Common/Resources/xlf/Strings.ja.xlf

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.2" xsi:schemaLocation="urn:oasis:names:tc:xliff:document:1.2 xliff-core-1.2-transitional.xsd">
   <file datatype="xml" source-language="en" target-language="ja" original="../Strings.resx">
     <body>
@@ -650,6 +650,16 @@ The following are names of parameters or literal values and should not be transl
         <target state="translated">NETSDK1146: PackAsTool は、設定されている TargetPlatformIdentifier をサポートしていません。たとえば、TargetFramework には net5.0-windows は指定できず、net 5.0 のみ使用できます。また PackAsTool は、.NET 5 以降を対象としている場合には、UseWPF や UseWindowsForms もサポートしていません。</target>
         <note>{StrBegin="NETSDK1146: "}</note>
       </trans-unit>
+      <trans-unit id="PackageContainsIncorrectlyCasedLocale">
+        <source>NETSDK1187: Package {0} {1} has a resource with the locale '{2}'. This locale has been normalized to the standard format '{3}' to prevent casing issues in the build. Consider notifying the package author about this casing issue.</source>
+        <target state="new">NETSDK1187: Package {0} {1} has a resource with the locale '{2}'. This locale has been normalized to the standard format '{3}' to prevent casing issues in the build. Consider notifying the package author about this casing issue.</target>
+        <note>Error code is NETSDK1187. 0 is a package name, 1 is a package version, 2 is the incorrect locale string, and 3 is the correct locale string.</note>
+      </trans-unit>
+      <trans-unit id="PackageContainsUnknownLocale">
+        <source>NETSDK1188: Package {0} {1} has a resource with the locale '{2}'. This locale is not recognized by .NET. Consider notifying the package author that it appears to be using an invalid locale.</source>
+        <target state="new">NETSDK1188: Package {0} {1} has a resource with the locale '{2}'. This locale is not recognized by .NET. Consider notifying the package author that it appears to be using an invalid locale.</target>
+        <note>Error code is NETSDK1188. 0 is a package name, 1 is a package version, and 2 is the incorrect locale string</note>
+      </trans-unit>
       <trans-unit id="PackageNotFound">
         <source>NETSDK1064: Package {0}, version {1} was not found. It might have been deleted since NuGet restore. Otherwise, NuGet restore might have only partially completed, which might have been due to maximum path length restrictions.</source>
         <target state="translated">NETSDK1064: パッケージ {0}、バージョン {1} が見つかりませんでした。NuGet の復元により、削除された可能性があります。それ以外の場合、NuGet の復元が最大パス長の制限のために一部分しか完了していない可能性があります。</target>

src/Tasks/Common/Resources/xlf/Strings.ko.xlf

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.2" xsi:schemaLocation="urn:oasis:names:tc:xliff:document:1.2 xliff-core-1.2-transitional.xsd">
   <file datatype="xml" source-language="en" target-language="ko" original="../Strings.resx">
     <body>
@@ -650,6 +650,16 @@ The following are names of parameters or literal values and should not be transl
         <target state="translated">NETSDK1146: PackAsTool은 설정 중인 TargetPlatformIdentifier를 지원하지 않습니다. 예를 들어, TargetFramework는 net5.0-windows를 사용할 수 없으며 net5.0만 지원합니다. 또한 PackAsTool은 .NET 5 이상을 대상으로 하는 경우 UseWPF 또는 UseWindowsForms를 지원하지 않습니다.</target>
         <note>{StrBegin="NETSDK1146: "}</note>
       </trans-unit>
+      <trans-unit id="PackageContainsIncorrectlyCasedLocale">
+        <source>NETSDK1187: Package {0} {1} has a resource with the locale '{2}'. This locale has been normalized to the standard format '{3}' to prevent casing issues in the build. Consider notifying the package author about this casing issue.</source>
+        <target state="new">NETSDK1187: Package {0} {1} has a resource with the locale '{2}'. This locale has been normalized to the standard format '{3}' to prevent casing issues in the build. Consider notifying the package author about this casing issue.</target>
+        <note>Error code is NETSDK1187. 0 is a package name, 1 is a package version, 2 is the incorrect locale string, and 3 is the correct locale string.</note>
+      </trans-unit>
+      <trans-unit id="PackageContainsUnknownLocale">
+        <source>NETSDK1188: Package {0} {1} has a resource with the locale '{2}'. This locale is not recognized by .NET. Consider notifying the package author that it appears to be using an invalid locale.</source>
+        <target state="new">NETSDK1188: Package {0} {1} has a resource with the locale '{2}'. This locale is not recognized by .NET. Consider notifying the package author that it appears to be using an invalid locale.</target>
+        <note>Error code is NETSDK1188. 0 is a package name, 1 is a package version, and 2 is the incorrect locale string</note>
+      </trans-unit>
       <trans-unit id="PackageNotFound">
         <source>NETSDK1064: Package {0}, version {1} was not found. It might have been deleted since NuGet restore. Otherwise, NuGet restore might have only partially completed, which might have been due to maximum path length restrictions.</source>
         <target state="translated">NETSDK1064: 패키지 {0}, 버전 {1}을(를) 찾을 수 없습니다. NuGet 복원 이후 삭제되었을 수 있습니다. 아니면, 최대 경로 길이 제한으로 인해 NuGet 복원이 부분적으로만 완료되었을 수 있습니다.</target>