fix: always read the romanization file for the corresponding language…

… in the `language` option

When I originally added this feature, I overlooked that this was actually different from UI localization.
It has different usage scenarios: UI main language and romanization files can be separated

src/uosc/lib/char_conv.lua

@@ -6,11 +6,7 @@ local data = {}
 local languages = get_languages()
 for i = #languages, 1, -1 do
 	lang = languages[i]
-	if (lang == 'en') then
-		data = {}
-	else
-		table_assign(data, get_locale_from_json(char_dir .. lang:lower() .. '.json'))
-	end
+	table_assign(data, get_locale_from_json(char_dir .. lang:lower() .. '.json'))
 end
 
 local romanization = {}