Added semi-colons to the end of the lines for Tweet and Message strings in English localization.

//twitter text filed placeholder
 "Tweet" = "Tweet";

 //universal
 "Message" = "Message";

Fixes warning I was seeing:
CFPropertyListCreateFromXMLData(): Old-style plist parser: missing semicolon in dictionary on line 278. Parsing will be abandoned. Break on _CFPropertyListMissingSemicolon to debug.