Force translation to be used only in server

Hello all, I am making a huge effort translating mods into my language (They are not usually translated). So I'd like to force that translations to be used only in my server (it is attractive for my server). If players have to download a new jar file with the translation, they can use it in other servers and I do not want it. Some mods can be translated using a cfg file and it is showed only in the server. How can I do that with all mods? thanks.

Hello Roman,

So, I understand the clients have to download the jar file with the translation.

Another question. I have translated the mod called "bloodmon" and here is the original text

text.bloodmoon.notify=The Blood Moon is rising...
text.bloodmoon.nosleep=You don't feel tired enough to sleep...
text.bloodmoon.force=There will be a Bloodmoon next night
text.bloodmoon.stop=Stopped the Bloodmoon
text.bloodmoon.commandError=Bloodmoon Handler not loaded, try to execute this from the overworld.
text.bloodmoon.entity=Monsters within 20 Blocks:

and here is the translation

text.bloodmoon.notify=La Luna de Sangre está naciendo...
text.bloodmoon.nosleep=No te sientes lo suficientemente cansado para dormir...
text.bloodmoon.force=Habrá una luna de sangre la noche siguiente
text.bloodmoon.stop=Luna de Sangre detenida
text.bloodmoon.commandError=El manipulador de la luna de sangre no está cargado, intenta ejecutar esto desde el mundo exterior.
text.bloodmoon.entity=Monstruos alrededor de 20 bloques:

But the first sentence appears in English and I dont understand why. It occurs with other mods (GUI buttons and showing messages do not get translated.

Quote from Roman

That's something you have to ask the mod creator

Perfect, thanks!