I don't know if it is related to my switch to and back from moksha, but now if I click main menu > applications, the categories have lost their icons, except the one of the wine category. Moreover, their names are not translated from english (to french). Rebooted several times, no effect.
I have checked that all the icon themes I've tried to use do have their 'categories' icons (faenza, numix-bevel, super-flat-remix, ...). And I remember I've seen them before anyway.
The icons show up as expected in the main menu (applications, omni, screenshot, desktop, windows...) and in the submenus, left to the applications' names, no problem.
About the translation, I've set the language to french and everything seems to be translated except this categories menu. (The main menu and the submenus are translated).