This is a tough thing you are asking for PandaTea.

The game throws Null Reference errors if localization is used and the Modlet isn't installed locally on each player's game. I wanted this Modlet pack to specifically be supported ONLY through installing it on the game server.
Once the code stabilizes a bit and I have some confidence we've found any bugs present, I may go back through and duplicate the entire Modlet pack to support localization. But as it stands right now, I can't do this without also requiring everyone to install the pack on each player's machine too.
7DTD Doesn't support providing BOTH the non-key and the key (localization) configuration of quests and items. It's one or the other.

This has been a long-standing "feature" of 7DTD. I am hopeful with their most recent localization release of 18.3 that they may be changing this and improving it in the near future.
*update* It does appear from their release notes for A18 that they intend to add proper push of localization in the future. The update reads:
"Support for localization from mods – not pushed from servers yet"