Hi,
In the wall activities text is visible between brackets{} so I have a wall activity like:
Username {multiple}{actors}{/multiple}{single}{actor}{/single} is/zijn lid geworden van de groep

I found several topics about it but i'm not sure what I can do about it. I am a little worried about the sql query, this is a live business site with a lot of visitors so nothing should go wrong.
I can delete all the code in the nl-NL.com.community.ini but I guess that is not the way because the codes are variables?

What can I do about it?

Hi Jose,

For fixing this follow my suggestion below :

1. Please make sure your 3rd party lang eg. nl-NL.com.community.ini is the newest one and support with the newest Jomsocial version
2. Run this query via phpmyadmin to remove the weird tag, because that tag came from old Jomsocial version streams / outdated language version :

UPDATE xxx_community_activities SET title = REPLACE( title,  "{actor}",  "" );
UPDATE xxx_community_activities SET title = REPLACE( title,  "{multiple}",  "" );
UPDATE xxx_community_activities SET title = REPLACE( title,  "{/multiple}",  "" );
UPDATE xxx_community_activities SET title = REPLACE( title,  "{single}",  "" );
UPDATE xxx_community_activities SET title = REPLACE( title,  "{/actor}",  "" );
UPDATE xxx_community_activities SET title = REPLACE( title,  "{/single}",  "" );