Feat: add german language support (#9892)

**What**
Added German language json file. 

**Why**
To be able to choose german language.

**How**
The File is translated with Google Translate, some human checks and corrections. I'm sure it's not perfect, but it is a good starting point. First the en.json was duplicated (as de.json) to be able to see the changes made and if the structure is still the same.

**Testing**
As mentioned in How, i checked if the structure is still the same.

Co-authored-by: Kasper Fabricius Kristensen <45367945+kasperkristensen@users.noreply.github.com>

packages/admin/dashboard/src/i18n/languages.ts

@@ -1,4 +1,4 @@
-import { enUS, pl } from "date-fns/locale"
+import { de, enUS, pl } from "date-fns/locale"
 import { Language } from "./types"
 
 export const languages: Language[] = [
@@ -8,9 +8,15 @@ export const languages: Language[] = [
     ltr: true,
     date_locale: enUS,
   },
+  {
+    code: "de",
+    display_name: "Deutsch",
+    ltr: true,
+    date_locale: de,
+  },
   {
     code: "pl",
-    display_name: "Polish",
+    display_name: "Polski",
     ltr: true,
     date_locale: pl,
   },

packages/admin/dashboard/src/i18n/translations/index.ts

@@ -1,9 +1,14 @@
+import de from "./de.json"
 import en from "./en.json"
 import pl from "./pl.json"
+
 export default {
   en: {
     translation: en,
   },
+  de: {
+    translation: de,
+  },
   pl: {
     translation: pl,
   },