Updated german translation

grammatical correction and more formal version of the text.
German translation update correction

there where some typos :-)
Add polish translation
Merge pull request #121 from DavorPadovan/feature/languages-website

Slovenian website translation
Added Estonian translation
Merge pull request #109 from danekszy/feature/languages-website

Add polish translation
Merge pull request #125 from kempu/feature/languages-website

Added Estonian translation
Merge pull request #106 from krautnerds/feature/languages-website

Updated german translation
Estonian - country code is ee
Languages update
Update site_lang.php
Merge pull request #128 from kempu/feature/languages-website

Update site_lang.php, for ee