DAR-1766, add validation and Error message for empty text Wordmark
DAR-1766, change message copy and fetch message in JS file
DAR-1766 missing newline
Merge branch 'dev' into DAR-1766

Conflicts:
	extensions/wikia/ThemeDesigner/ThemeDesigner.i18n.php
Merge pull request #1429 from Wikia/DAR-1766

Dar 1766