diff --git a/googletrans/constants.py b/googletrans/constants.py
index b762a3b..23b1564 100644
--- a/googletrans/constants.py
+++ b/googletrans/constants.py
@@ -1,7 +1,7 @@
 DEFAULT_USER_AGENT = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64)'
 
 DEFAULT_CLIENT_SERVICE_URLS = (
-    'translate.google.com',
+    'translate.googleapis.com',
 )
 
 DEFAULT_SERVICE_URLS = ('translate.google.ac', 'translate.google.ad', 'translate.google.ae',
@@ -117,8 +117,8 @@
     "cha": "chamorro",
     "che": "chechen",
     "zh": "chinese",
-    "zh-CN": "chinese (simplified)",
-    "zh-TW": "chinese (traditional)",
+    "zh-cn": "chinese (simplified)",
+    "zh-tw": "chinese (traditional)",
     "chk": "chuukese",
     "chv": "chuvash",
     "co": "corsican",
@@ -126,7 +126,7 @@
     "hr": "croatian",
     "cs": "czech",
     "da": "danish",
-    "fa-AF": "dari",
+    "fa-af": "dari",
     "dv": "dhivehi",
     "din": "dinka",
     "doi": "dogri",
@@ -213,7 +213,7 @@
     "mak": "makassar",
     "mg": "malagasy",
     "ms": "malay",
-    "ms-Arab": "malay (jawi)",
+    "ms-arab": "malay (jawi)",
     "ml": "malayalam",
     "mt": "maltese",
     "mam": "mam",
@@ -224,17 +224,17 @@
     "mwr": "marwadi",
     "mfe": "mauritian creole",
     "mhr": "meadow mari",
-    "mni-Mtei": "meiteilon (manipuri)",
+    "mni-mtei": "meiteilon (manipuri)",
     "min": "minang",
     "lus": "mizo",
     "mn": "mongolian",
     "my": "myanmar (burmese)",
     "nhe": "nahuatl (eastern huasteca)",
-    "ndc-ZW": "ndau",
+    "ndc-zw": "ndau",
     "nde": "ndebele (south)",
     "new": "nepalbhasa (newari)",
     "ne": "nepali",
-    #'bm-Nkoo': 'nko',
+    #'bm-nkoo': 'nko',
     "no": "norwegian",
     "nus": "nuer",
     "ny": "nyanja (chichewa)",
@@ -250,7 +250,7 @@
     "por": "portuguese (portugal)",
     "pt": "portuguese (portugal, brazil)",
     "pa": "punjabi",
-    "pa-Arab": "punjabi (shahmukhi)",
+    "pa-arab": "punjabi (shahmukhi)",
     "kek": "q'eqchi'",
     "qu": "quechua",
     "rom": "romani",
@@ -285,7 +285,7 @@
     "tl": "tagalog (filipino)",
     "tah": "tahitian",
     "tg": "tajik",
-    "ber-Latn": "tamazight",
+    "ber-atn": "tamazight",
     "ber": "tamazight (tifinagh)",
     "ta": "tamil",
     "tt": "tatar",