Fixes #1214 Language editor improvement

* editor finds translation issues and show appropriate info on files
list when in editwith mode.
* editor finds translation issues and mark phrases that require
attention when editing phrases in editwith mode.
* removed hardcoded html and added css classes to allow editor styling.
* improved stability.
* fixes bug where in editwith mode, editor shows only variables that
existed in both files but hides all other variables which caused
unability to translate new variables.