HTML5: Make `OS.get_locale()` match other platforms
HTML5: Make `OS.get_locale()` match other platforms

Fixes #63029.

sanikoyes/godot,firefly2442/godot,guilhermefelipecgs/godot,josempans/godot,Shockblast/godot,BastiaanOlij/godot,guilhermefelipecgs/godot,Zylann/godot,ZuBsPaCe/godot,sanikoyes/godot,pkowal1982/godot,Zylann/godot,BastiaanOlij/godot,ZuBsPaCe/godot,Shockblast/godot,akien-mga/godot,sanikoyes/godot,Valentactive/godot,Shockblast/godot,guilhermefelipecgs/godot,pkowal1982/godot,josempans/godot,godotengine/godot,Valentactive/godot,ZuBsPaCe/godot,guilhermefelipecgs/godot,Valentactive/godot,Valentactive/godot,josempans/godot,sanikoyes/godot,godotengine/godot,BastiaanOlij/godot,guilhermefelipecgs/godot,Valentactive/godot,akien-mga/godot,vkbsb/godot,BastiaanOlij/godot,Zylann/godot,firefly2442/godot,guilhermefelipecgs/godot,vkbsb/godot,vkbsb/godot,firefly2442/godot,Zylann/godot,akien-mga/godot,godotengine/godot,ZuBsPaCe/godot,pkowal1982/godot,BastiaanOlij/godot,ZuBsPaCe/godot,pkowal1982/godot,ZuBsPaCe/godot,josempans/godot,godotengine/godot,josempans/godot,vkbsb/godot,vkbsb/godot,vkbsb/godot,Shockblast/godot,firefly2442/godot,pkowal1982/godot,godotengine/godot,godotengine/godot,godotengine/godot,josempans/godot,firefly2442/godot,pkowal1982/godot,firefly2442/godot,Zylann/godot,akien-mga/godot,akien-mga/godot,Shockblast/godot,ZuBsPaCe/godot,firefly2442/godot,akien-mga/godot,sanikoyes/godot,sanikoyes/godot,sanikoyes/godot,godotengine/godot,Zylann/godot,akien-mga/godot,vkbsb/godot,Shockblast/godot,vkbsb/godot,BastiaanOlij/godot,pkowal1982/godot,akien-mga/godot,Valentactive/godot,Zylann/godot,BastiaanOlij/godot,Valentactive/godot,josempans/godot,ZuBsPaCe/godot,pkowal1982/godot,firefly2442/godot,josempans/godot,Zylann/godot,guilhermefelipecgs/godot,Shockblast/godot,BastiaanOlij/godot,Valentactive/godot,sanikoyes/godot,Shockblast/godot,guilhermefelipecgs/godot