transfer about.gui to use loca keys

[Lars Gusowski]

It would be nice if https://bitbucket.org/dalerank/caesaria/src/4b7a8a7081a322d82b2be7877115d0be0abc3404/bin/resources/gui/about.gui?fileviewer=file-view-default could be translated in the languages.

Therfore a transformation into loca_keys is needed.

##about_about## ##about_bugs## ##about_translation## ##about_feedback## ##about_join_us##

and wouldn't it be better to link the issue tracker instead of using the mail? At the issue tracker has everybody access - on the mail only some people. But if we have a mail we could contact the user and ask for feedback - most of the anonymus users aren't comming back

[dalerank]

Sure @lars_gusowski, i will add workaround for unlocalized text, you may use ##some_text## for placeholders