ticket 1660 - update LINGUAS file, add missing po files

Our LINGUAS file and the set of po files have diverged from what's on
Transifex. We should update the LINGUAS file to match the set of
translations on Transifex and add po files currently on Transifex but
not in our git repo to our git repo.

install/po/LINGUAS

@@ -1,17 +1,22 @@
+# Languages in the sort order on Transifex
+as      # Assamese
 bn_IN   # Bengali (India)
-de      # German
-es      # Spanish (Castilian)
-fr      # French
-id      # Indonesian
-he      # Hebrew
-it      # Italian (Italy)
-ja      # Japanese
-kn      # Kannada
-ko      # Korean
-pl      # Polish
-pt      # Portuguese
-pt_BR   # Portuguese (Brazilian)
-ru      # Russian
-uk      # Ukrainian
 zh_CN   # Chinese (China)
 zh_TW   # Chinese (Taiwan)
+nl      # Dutch
+fr      # French
+de      # German
+el      # Greek
+gu      # Gujarati
+id      # Indonesian
+ja_JP   # Japanese (Japan)
+ja      # Japanese
+kn      # Kannada
+fa      # Persian
+pl      # Polish
+pt_BR   # Portuguese (Brazilian)
+pt      # Portuguese
+ru      # Russian
+es      # Spanish (Castilian)
+sv      # Swedish
+uk      # Ukrainian