feat(language): add nepali romanized (@anuzpandey) (monkeytypegame#6182)

### Description

Added Romanized Nepali language word lists (similar to
`persian_romanized`)

### Checks

- [x] Adding a language or a theme?
- [x] If is a language, did you edit `_list.json`, `_groups.json` and
add `languages.json`?
- [x] Make sure the PR title follows the Conventional Commits standard.
(https://www.conventionalcommits.org for more info)
- [x] Make sure to include your GitHub username prefixed with @ inside
parentheses at the end of the PR title.

Author: anuzpandey

frontend/static/languages/_groups.json

@@ -439,7 +439,7 @@
   },
   {
     "name": "nepali",
-    "languages": ["nepali", "nepali_1k"]
+    "languages": ["nepali", "nepali_1k", "nepali_romanized"]
   },
   {
     "name": "santali",

frontend/static/languages/_list.json

@@ -22,6 +22,7 @@
   ,"french_600k"
   ,"nepali"
   ,"nepali_1k"
+  ,"nepali_romanized"
   ,"sanskrit"
   ,"sanskrit_roman"
   ,"santali"