Updated by ALF automation.
Fix Unit Test Failing: ExtensionManager
Update german translation

As it was changed in https://github.com/adobe/brackets/blob/master/src/nls/root/strings.js#L152
UNKOWN -> UNKNOWN

Maybe this must be changed elsewhere
Update strings.js
Merge pull request #5130 from SAPlayer/patch-5

UNKOWN -> UNKNOWN
Merge pull request #5129 from SAPlayer/patch-4

Update german translation
UNKOWN -> UNKNOWN
UNKOWN -> UNKNOWN
UNKOWN -> UNKNOWN
UNKOWN -> UNKNOWN
UNKOWN -> UNKNOWN
UNKOWN -> UNKNOWN
UNKOWN -> UNKNOWN
UNKOWN -> UNKNOWN
UNKOWN -> UNKNOWN
UNKOWN -> UNKNOWN
UNKOWN -> UNKNOWN
UNKOWN -> UNKNOWN
UNKOWN -> UNKNOWN