Ok, that was it
Our site is in German!
So the original en-GB language file contains this:
; first line should start with semicolon for transifex to work properly
JOMSOCIAL_ADDGENERAL_COMMENT="%s commented on <a href='%s'>%s</a>"
JOMSOCIAL_WALL="wall"
JOMSOCIAL_NEGATIVEVOTE_COMMENT="%s dislikes %s's comment in <a href='%s'>%s</a>"
JOMSOCIAL_POSITIVEVOTE_COMMENT="%s likes %s's comment in <a href='%s'>%s</a>"
JOMSOCIAL_ITEM="item"
The de-DE language file contains this:
JOMSOCIAL_ADDGENERAL_COMMENT="{actor} {single}hat einen Kommentar geschrieben{/single}{multiple}hat einen weiteren Kommentar geschrieben{/multiple}"
JOMSOCIAL_ADDJOMSOCIAL_COMMENT_TARGET="{actor} {single}komentierte{/single}{multiple}hat einen weiteren Kommentar geschrieben{/multiple} in {target}'s"
JOMSOCIAL_ADDJOMSOCIAL_COMMENT_OWN="{actor} {single}komentierte{/single}{multiple}hat einen weiteren Kommentar geschrieben{/multiple} in seinem/seiner"
JOMSOCIAL_WALL="wall"
JOMSOCIAL_DELETEGENERAL_COMMENT="{actor} {single}hat einen Kommentar gelöscht{/single}{multiple}hat diverse Kommentare gelöscht{/multiple}"
JOMSOCIAL_DELETEJOMSOCIAL_COMMENT_TARGET="{actor} {single}hat einen Kommentar gelöscht{/single}{multiple}hat diverse Kommentare gelöscht{/multiple} in {target}'s"
JOMSOCIAL_DELETEJOMSOCIAL_COMMENT_OWN="{actor} {single}hat einen Kommentar gelöscht{/single}{multiple}hat einen weiteren Kommentar gelöscht{/multiple} in seinem/seiner"
JOMSOCIAL_NEGATIVEVOTE_COMMENT="{actor} {single}mag {target}'s Kommentar nicht{/single}{multiple}mag verschiedene Kommentare nicht{/multiple}"
JOMSOCIAL_NEGATIVEVOTE_COMMENT_GUEST="{actor} {single}mag {target}'s Kommentar nicht{/single}{multiple}mag verschiedene Kommentare nicht{/multiple}"
JOMSOCIAL_POSITIVEVOTE_COMMENT="{actor} {single}mag {target}'s Kommentar{/single}{multiple}mag verschiedene Kommentare{/multiple}"
JOMSOCIAL_POSITIVEVOTE_COMMENT_GUEST="{actor} {single}mag {target}'s Kommentar{/single}{multiple}mag verschiedene Kommentare{/multiple}"
JOMSOCIAL_HERE="hier"
JOMSOCIAL_IN="in"
I added the english one in the german, translated the elements I need, and it seems, that everything works fine right now.
Will test further tomorrow, but I looks goog so far
Thank you for your help.
Edit: Ok tested everything and I got one more thing to go.
The comments on the k2 article shows the USERNAMES, the entry in the Jomsocial stream shows the Real Name. Hot can I change the language file to show the Unsername instead of the real name.