Unify Codestyle of stringtable.xml

Use tabs not spaces at the beginning of a line
Fix EOL (some lines contained spaces or tabs at the end of a line)

I know this commit is huge but i think it's good to unify the codestyle of this important file.

Czech to latest commits is in progress (9089a4e6aca21796060d73f5c26e553b1b8cfcc9, f8cffef0a42ef26e4736718a2019665f1e9086d4, 65a82136e80551e8a6593ab92e2597ffbba57250)