Update for installer languages

- added Chinese Traditional, Serbian, Latvian translation https://github.com/SpotX-CLI/SpotX-Win/issues/250 https://github.com/SpotX-CLI/SpotX-Win/issues/238 https://github.com/SpotX-CLI/SpotX-Win/issues/237
- added ability to embed similar languages
- fixed some minor bugs in the installer language management code

.github/ISSUE_TEMPLATE/installer-new-translation.yml

@@ -29,10 +29,10 @@ body:
         
       Good luck to you. 
     value: |
-      Author          = "Patch author:"
-      Author2         = "@Amd64fox"
-      TranslationBy   = "Translation author:"
-      TranslationBy2  = "@"
+      Welcome         = "
+╔══════════════════════════════╗
+║ Welcome to SpotX for Windows ║
+╚══════════════════════════════╝"
       Incorrect       = "Oops, an incorrect value,"
       Incorrect2      = "enter again through "
       Download        = "Error downloading"