Changes in Game Champion voices (Including Legendary skins) to Japanese without changing the in game text, It's as simple as that.
TROUBLESHOOTING:
The mod SHOULD work for all client Languages, i tested it with german, english(us), french, latam, and it worked, im 99% sure it will work for all client languages, but maybe there is one where it doesnt.
If you have other skin mods installed that change champion voices you need to tick
"Suppress install conflicts" in CSLOL Manager settings or the Mod won't let you turn it on.
Priority based on what voice gets picked is based on alphabetical order
For example if you have Gojo Hwei installed and This mod installed, Because G comes before J in the alphabet, the Gojo Hwei Voice will play instead of the Japanese voices.
To change the priority yourself, for example if you wanted the Japanese champion voices to play there instead:
Go to your cslol-manager folder, then click on the installed folder, this will list all your mods, find whatever mod you want to have priority voices on, and rename the folder by putting in an A or B or C Etc. at the very start of it.
(Note you HAVE to go to the installed folder directory, editing the mod name in the CSlol Manager APP itself WILL NOT work)
For example, if you want japanese voices to always play, Rename the folder "Japanese Champion Voices" to "A Japanese Champion Voices" this way the mod will have the highest priority and always replace the voices with the japanese ones, even if youre using a custom skin that has its own voices.
If instead you dont want it to replace the voices of a custom skin that has its own, then you rename that custom skin by putting in A at the start of its name, and then maybe B on japanese voices if you want it to replace voices of all custom skins except for those that start with A.
You get the idea, if you need more help you can ask in the comments.