fix(language): spelling and translation errors for Frisian (@M3R14M) (monkeytypegame#6263)

### Description

The language was added as "Frysk", but the English name is "Frisian".
I've updated the filenames and `_groups.json` and `_list.json` to use
the correct name. There were also a few spelling errors, Dutch-isms and
unfinished translations from English that I fixed.

### Checks

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tag them below.
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Related PRs: monkeytypegame#5211 monkeytypegame#4317

Author: M3R14M

frontend/static/languages/_groups.json

@@ -548,8 +548,8 @@
     "languages": ["yiddish"]
   },
   {
-    "name": "frysk",
-    "languages": ["frysk", "frysk_1k"]
+    "name": "frisian",
+    "languages": ["frisian", "frisian_1k"]
   },
   {
     "name": "pashto",

frontend/static/languages/_list.json

@@ -304,8 +304,8 @@
   ,"wordle_1k"
   ,"typing_of_the_dead"
   ,"yiddish"
-  ,"frysk"
-  ,"frysk_1k"
+  ,"frisian"
+  ,"frisian_1k"
   ,"pashto"
   ,"euskera"
   ,"klingon"

frontend/static/languages/frysk.json frontend/static/languages/frisian.jsonfrontend/static/languages/frysk.json renamed to frontend/static/languages/frisian.json

@@ -1,16 +1,16 @@
 {
-  "name": "frysk",
+  "name": "frisian",
   "bcp47": "fy-FY",
   "words": [
     "aap",
     "acht",
-    "maoi",
+    "moai",
     "efter",
     "klear",
-    "alsjebleaft",
+    "asjebleaft",
     "as",
     "altyd",
-    "antwoord",
+    "antwurd",
     "appel",
     "poppe",
     "bist",
@@ -24,14 +24,14 @@
     "pake",
     "beppe",
     "lokwinske",
-    "skinkje",
+    "skinke",
     "tsjoch",
     "fûgel",
     "boer",
     "skûtsje",
     "fjild",
     "skiep",
-    "boerderij",
+    "buorkerij",
     "wâld",
     "sliep",
     "wjirm",
@@ -40,7 +40,7 @@
     "hallo",
     "jo",
     "it",
-    "an",
+    "oan",
     "goed",
     "troch",
     "en",
@@ -49,23 +49,23 @@
     "fan",
     "yn",
     "binne",
-    "leuk",
-    "onaangenaam",
+    "aardich",
+    "ûnoangenaam",
     "groetnis",
     "dei",
     "tút",
     "famke",
     "doei",
     "hûs",
-    "dankewol",
+    "tankjewol",
     "mear",
     "fakânsjes",
     "wêr",
     "nei",
     "wolle",
     "op",
     "gean",
-    "bee",
+    "by",
     "sizze",
     "freon",
     "fluch",
@@ -105,7 +105,7 @@
     "wat",
     "man",
     "allinne",
-    "ût",
+    "út",
     "frou",
     "tiid",
     "sjo",
@@ -172,7 +172,7 @@
     "tsiis",
     "aai",
     "bûter",
-    "pen",
+    "pinne",
     "piper",
     "plafond",
     "oseaan",