Adds auto translate feature.

Auto translates the text if
1) query string contains language=xx
2) 'lt_user_lang' cookie is set
3) user has specified a language in his preferences.

Sets a cookie on manual tranlation and on occurance of a query string with
language=xx

Complete functionability can be disabled by setting $egAutoTranslate to
false.

Change-Id: I28677e54d10a1c2073e3b063033140cdbf20ba41