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

scripts/installer-lang/ru.ps1

@@ -1,6 +1,8 @@
 [PSCustomObject]@{
-    Author          = "Автор патча:"
-    Author2         = "@Amd64fox"
+    Welcome         = "
+╔══════════════════════════════════════╗
+║ Добро пожаловать в SpotX для Windows ║
+╚══════════════════════════════════════╝"
     Incorrect       = "Ой, некорректное значение,"
     Incorrect2      = "повторите ввод через"
     Download        = "Ошибка загрузки"