Simplify reloadLocalizations method and add comments in regexp

[marchv]

Hi :)

I have started to look into how to support comments, which also can be edited from the plug-in. But my first iteration was a simplification of the regular expression handling, which I hope you like.

Thanks and best regards! :)

[marchv]

This simplification seems also to fix the problem with comments mentioned by others :)

[marchv]

Hello :) I have completed my support for comments now. If this could be adopted then the plugin would fit nicely together with the output of genstrings and also Transifex's comments. The last commit however is special but it tries to solve the problem where multiple string-files with same name and same language are found.

Cheers!