fix(language): add unused japanese_romaji (Eggflaw) (#5290)

* Add japanese_romaji to _groups file

* Add japanese_romaji to _list file

* japanese_romaji.json: remove duplicates

frontend/static/languages/_groups.json

@@ -388,7 +388,7 @@
   },
   {
     "name": "japanese",
-    "languages": ["japanese_hiragana", "japanese_katakana"]
+    "languages": ["japanese_hiragana", "japanese_katakana", "japanese_romaji"]
   },
   {
     "name": "hindi",

frontend/static/languages/_list.json

@@ -235,6 +235,7 @@
   ,"myanmar_burmese"
   ,"japanese_hiragana"
   ,"japanese_katakana"
+  ,"japanese_romaji"
   ,"sinhala"
   ,"latvian"
   ,"latvian_1k"

frontend/static/languages/japanese_romaji.json

@@ -38,7 +38,6 @@
     "densha",
     "kami",
     "osoi",
-    "hayai",
     "shinu",
     "iru",
     "en",
@@ -129,7 +128,6 @@
     "oto",
     "seiko",
     "naka",
-    "sakana",
     "ringo",
     "umai",
     "sumaho",