Check updates from GitHub repo

from master branch, if mode == "stable"
from development branch, if mode == "development"
Add tools data (jar files)
Fix JARs urls
Add icons of tools in combobox
Add JSeparator before Favourites in tools combobox
Update instructions for adding a new QA tool
Merge branch 'master' into development
Add Wiki link to admin_level tag
Fix encoding of favourite area country name

Bug reported by xmypblu
Update changes
Update translations

German by Poppei82
French by operon
Fix modality of dialog for creating a new zone
Update CHANGES.md
Add German translation of Favourites tool
Fix translation
Merge pull request #4 from poppei82/development

German translation for "Favourites" tool
Add user information to the error's info dialog

Request by poppei82
Add new strings for error info dialog
Update KeepRight checks and translations
Merge branch 'development' of https://github.com/simone-f/qat_script into development