Translations:Extension:Babel/61/en

Flexibility and code quality improvements. Replaced $wgBabelUseLevelZeroCategory, $wgBabelUseSimpleCategories, and $wgBabelUseMainCategories with $wgBabelCategoryNames, <tvar|var5>$wgBabelMainCategory</tt></>, and <tvar|var6>$wgBabelDefaultLevel</tt></>.