Fix #1071 - allows embedding only one language
Fail build if languages aren't defined as UMD
Ignore customlang embedded files
Fixed flaky min/max test
Merge pull request #1080 from wyantb/fix-1071

Embed Language Tweaks
Make jshint happy
Corrected short weekdays in Russian and Ukrainian; see #999
Merge pull request #1082 from Oire/feature/rus-ukr-short-weekdays

Corrected short weekdays in Russian and Ukrainian; see #999