Most thanks for the fast answer.
When I have installed version 8.1 I have charged as well the new roles. The consequence is for some tags, that I have twice time the same role. Example: tag Marriage -- role: Father Bride and father bride. The first created by version 8, the second stood there (my creation in the version 7). The sentences for both roles were now however no longer modifying.
I have again installed the project from the backup, however now with deactivated new roles. The result proves be the same.
Remarks: I used the Dutch language.
With thanks in advancefor yr comments en help.