Clarify the reviewer window title

"1 day 2" seems really strange to me. "1 day 2 hours" would be too
long for most smartphone. But "1 day 2h" seems reasonable to me

Also, "plural" does not allow for two parameters, and it would have
been complex to consider both words if they are singular or plural.

Regarding "1 hour 5" I preferred to not change it. "1 hour 5 min" woud
add far too many character. "1 hour 5m" sounds strange. And stating "1
hour 5" is far more standard than "1 day 5"

AnkiDroid/src/main/res/values/01-core.xml

@@ -43,8 +43,8 @@
         <item quantity="other">%1$d hours %2$d left</item>
     </plurals>
     <plurals name="reviewer_window_title_days_new">
-        <item quantity="one">%1$d day %2$d left</item>
-        <item quantity="other">%1$d days %2$d left</item>
+        <item quantity="one">%1$d day %2$dh left</item>
+        <item quantity="other">%1$d days %2$d h left</item>
     </plurals>
     <string name="no_cards_placeholder_title">Collection is empty</string>
     <string name="no_cards_placeholder_description">Start adding cards\nusing the + icon.</string>