Added Polski (#132)

* Create pl-PL.json

from https://github.com/louislam/dockge/pull/90 with merged review

* Update pl-PL.json

missed a few and noticed a few things that could be changed

* Add to list

* No overflow text

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Co-authored-by: Louis Lam <louislam@users.noreply.github.com>

frontend/src/i18n.ts

@@ -7,6 +7,7 @@ const languageList = {
     "es": "Español",
     "de": "Deutsch",
     "fr": "Français",
+    "pl-PL": "Polski",
     "pt": "Português",
     "sl": "Slovenščina",
     "tr": "Türkçe",