Thread:Support/"Invalid token" message

In the attempt to rectify a message (which is: "hlenċa undermearcian:" for "link underlining:" and which should be "hlencan undermearcian:" or "mearcian under hlencum:") for the Ang translation project of Wikimedia, I constantly get the message "invalid token", and no save. WHY? How to get past this? Does it prevent my saving the message?