in vanilla 2.1 you could do this (perhaps the same thing if 2.2 doesn't change it for you). you could make a request on Github to make it translateable. you might be able to replace function with a bootstrap config file. or you request A core change via github ... to replace the Logo Function in…
Seems like if you are going to have a multilingual forum. Things should be translateable via locales and not need more plugins for the Title itself. Perhaps better in core. similar to issue a while back for need of user translateable categories. they were amenable here for categories:…