Suppress errors for setcookie and session_start in user model

Occured if output was already sent (e.g. with install script)
get area handle and name through method which is easier to override
fix theme name in tinymce plugin translations
Revert "get area handle and name through method which is easier to override"

This reverts commit 02d027478f61968632bfed630b70cc62f6a9d21f.
translations for simple theme added
check if job is already installed
make sure we don't get a result like my-page/?&var=value
Merge pull request #1664 from worldskills/fix-install-concrete5

Suppress warnings for setcookie and session_start in user model
Merge pull request #1676 from Remo/fix-job-import

check if job is already installed
Merge pull request #1677 from Remo/fix-url-builder

make sure we don't get a result like my-page/?&var=value
Merge pull request #1671 from Remo/tinymce-lang-packs

Tinymce lang packs handle fixed