Added Slovenian translation

Merge-request: 1978
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>
(cherry picked from commit 674c2635)

share/qtcreator/translations/translations.pro

 include(../../../qtcreator.pri)
 
-LANGUAGES = de es fr it ja pl ru
+LANGUAGES = de es fr it ja pl ru sl
 
 # var, prepend, append
 defineReplace(prependAll) {