Create a Megamenu caption with accentuated char => This works fine
Edit any menu item with joomla admin (just open/save)
Template returns to defaults
What happens :
In the database, template parameters field is altered because all accentuated chars are escaped by a "\" when the mm_config_needupdate flag is added => field is now unreadable/unparsable =>default parameters are used.
I did not try with apostrophe which might also cause trouble.
This makes one of the superb features of T3 unusable in many countries/languages 
