Merge branch 'master' of https://github.com/piwik/piwik

core/Translate.php

core/Translate/Filter/ByBaseTranslations.php

core/Translate/Filter/ByParameterCount.php

core/Translate/Filter/EmptyTranslations.php

core/Translate/Filter/EncodedEntities.php

core/Translate/Filter/FilterAbstract.php

core/Translate/Filter/UnnecassaryWhitespaces.php

core/Translate/Validate/CoreTranslations.php

core/Translate/Validate/NoScripts.php

core/Translate/Validate/ValidateAbstract.php

core/Translate/Writer.php

core/TranslationWriter.php

lang/am.json

lang/ar.json

lang/be.json

lang/bg.json

lang/bs.json

lang/ca.json

lang/cs.json

lang/da.json