feat(lang): add amharic 1k and amharic 5k (@Akuna444) (monkeytypegame#6055)

Author: Akuna444

frontend/static/languages/_groups.json

@@ -504,7 +504,7 @@
   },
   {
     "name": "amharic",
-    "languages": ["amharic"]
+    "languages": ["amharic", "amharic_1k", "amharic_5k"]
   },
   {
     "name": "oromo",

frontend/static/languages/_list.json

@@ -279,6 +279,8 @@
   ,"uzbek_70k"
   ,"malayalam"
   ,"amharic"
+  ,"amharic_1k"
+  ,"amharic_5k"
   ,"oromo"
   ,"oromo_1k"
   ,"oromo_5k"