@ respectful observer - Malta is saturated with foreigners from EU and eastern European countries since joining the EU several years ago - especially Serbians. (I know, they're not in the EU. Don't ask!)
So it can be seen from the org's wording that they are not looking for foreign language speaking JW's to help convert the immigrants, but rather, to tackle the serious lack/decline in the native Maltese JW numbers.
Good news indeed! :)