Ok thanks. So I probably have problems to unterstand your answer before. The state of play is:
In .pot-file there is: Notifications <span class=\"%s\">%s</span>
In .po-file buddypress-de_DE.po there is: Notifications <span class=\"%s\">%s</span>
In .po-file buddypress-de_DE.po there is the translation: Benachrichtigungen <span class=\"%s\">%s</span>
@danbp: Thanks for your help. But it’s still not working. What I have done:
(1) Downloaded newest version of buddypress (2.1.1).
(2) Replaced my current buddypress.pot on webserver with the newest version (buddypress/buddypress.pot).
(3) Open the file with poedit.
(4) Looked for Notifications <span class=\"%s\">%s</span>
(5) Added the translation Benachrichtigung <span class=\"%s\">%s</span>
(6) Upload the buddypress.pot again.
Is there any mistake in my way to fix that problem? I’m using a child theme if this is important to you.