update b8 to version 0.6.1

Class b8_storage_mysql does not get updated during this commit,
because our implementation already uses PDO_MySQL instead of
the old mysql API used by the offical b8 codebase's class and
the fix for the potential SQL injection is already included in
our PDO version.
add missing English (US) language texts

This commit corresponds to the changes that were made to the
German language file in commit f7599de3af.
It also fixes a typo in the German template language file.
fix errors in English (US) language file
Merge pull request #100 from Thoronador/feature-language-en_US

add missing English (US) language texts
Merge pull request #99 from Thoronador/feature-b8-0.6.1-update

update b8 to version 0.6.1
fix psr-1

Signed-off-by: Sweil <mail@sweil.de>
Merge branch 'alix6-bugfixes' of github.com:Sweil/Frogsystem-2 into alix6-bugfixes
fixed missing redirection after wrong login

Signed-off-by: Sweil <mail@sweil.de>