Translation: Fix logic bug finding match for regional locales
Translation: Fix logic bug finding match for regional locales

The  match test was inverted. The rest of the changes
are documentation and cleanup.

Fixes #26346 and fixes #31192.

Paulloz/godot,ZuBsPaCe/godot,akien-mga/godot,Shockblast/godot,sanikoyes/godot,guilhermefelipecgs/godot,firefly2442/godot,Faless/godot,Paulloz/godot,Valentactive/godot,vnen/godot,MarianoGnu/godot,DmitriySalnikov/godot,Zylann/godot,josempans/godot,firefly2442/godot,pkowal1982/godot,pkowal1982/godot,honix/godot,akien-mga/godot,Faless/godot,guilhermefelipecgs/godot,BastiaanOlij/godot,DmitriySalnikov/godot,godotengine/godot,ZuBsPaCe/godot,honix/godot,Valentactive/godot,Faless/godot,Shockblast/godot,Shockblast/godot,pkowal1982/godot,sanikoyes/godot,vnen/godot,Zylann/godot,vnen/godot,Faless/godot,ZuBsPaCe/godot,sanikoyes/godot,pkowal1982/godot,Zylann/godot,Faless/godot,Paulloz/godot,firefly2442/godot,BastiaanOlij/godot,ex/godot,guilhermefelipecgs/godot,Faless/godot,josempans/godot,Paulloz/godot,godotengine/godot,DmitriySalnikov/godot,pkowal1982/godot,vnen/godot,guilhermefelipecgs/godot,godotengine/godot,BastiaanOlij/godot,Zylann/godot,DmitriySalnikov/godot,ex/godot,godotengine/godot,vkbsb/godot,ZuBsPaCe/godot,honix/godot,sanikoyes/godot,DmitriySalnikov/godot,vkbsb/godot,ZuBsPaCe/godot,akien-mga/godot,godotengine/godot,Shockblast/godot,BastiaanOlij/godot,Zylann/godot,vkbsb/godot,josempans/godot,ex/godot,Valentactive/godot,josempans/godot,ZuBsPaCe/godot,DmitriySalnikov/godot,ex/godot,vkbsb/godot,vnen/godot,Shockblast/godot,Valentactive/godot,Valentactive/godot,firefly2442/godot,guilhermefelipecgs/godot,godotengine/godot,sanikoyes/godot,firefly2442/godot,Faless/godot,BastiaanOlij/godot,akien-mga/godot,vkbsb/godot,firefly2442/godot,MarianoGnu/godot,akien-mga/godot,Paulloz/godot,josempans/godot,Valentactive/godot,Paulloz/godot,Paulloz/godot,honix/godot,Zylann/godot,Faless/godot,Zylann/godot,firefly2442/godot,akien-mga/godot,honix/godot,MarianoGnu/godot,ZuBsPaCe/godot,vnen/godot,akien-mga/godot,vnen/godot,ex/godot,Shockblast/godot,BastiaanOlij/godot,DmitriySalnikov/godot,sanikoyes/godot,vkbsb/godot,pkowal1982/godot,josempans/godot,MarianoGnu/godot,pkowal1982/godot,vkbsb/godot,sanikoyes/godot,firefly2442/godot,BastiaanOlij/godot,godotengine/godot,pkowal1982/godot,vnen/godot,josempans/godot,josempans/godot,MarianoGnu/godot,Shockblast/godot,MarianoGnu/godot,ex/godot,MarianoGnu/godot,akien-mga/godot,guilhermefelipecgs/godot,MarianoGnu/godot,guilhermefelipecgs/godot,Shockblast/godot,godotengine/godot,Valentactive/godot,ZuBsPaCe/godot,sanikoyes/godot,ex/godot,honix/godot,Zylann/godot,BastiaanOlij/godot,vkbsb/godot,ex/godot,Valentactive/godot,guilhermefelipecgs/godot