message review changes: removed part of our code which is not needed anymore
messages review changes: small issues fixed such as typos, wrong words etc.
fixed service-error
added GENDER to the messages which should use it for different languages than English, added Polish examples
first approach of providing username to the message
changed the file-too-large message and used $wgLang->formatSize() to take the max size of a file
added description of $min and $max parameters in parser-tag-error messages
CR change: should -> must
Merge pull request #4137 from Wikia/MOB-2051

MOB-2051