Add dropdown for language of Article

And a configuration with the available Deepl source and target languages.

config/config.exs

@@ -10,6 +10,69 @@ import Config
 config :outlook,
   ecto_repos: [Outlook.Repo]
 
+config :outlook, :deepl,
+  source_langs: [
+    {"English", "EN"},
+    {"Russian", "RU"},
+    {"German", "DE"},
+    {"Spanish", "ES"},
+    {"Bulgarian", "BG"},
+    {"Czech", "CS"},
+    {"Danish", "DA"},
+    {"Greek", "EL"},
+    {"Estonian", "ET"},
+    {"Finnish", "FI"},
+    {"French", "FR"},
+    {"Hungarian", "HU"},
+    {"Indonesian", "ID"},
+    {"Italian", "IT"},
+    {"Japanese", "JA"},
+    {"Lithuanian", "LT"},
+    {"Latvian", "LV"},
+    {"Dutch", "NL"},
+    {"Polish", "PL"},
+    {"Portuguese", "PT"},
+    {"Romanian", "RO"},
+    {"Slovak", "SK"},
+    {"Slovenian", "SL"},
+    {"Swedish", "SV"},
+    {"Turkish", "TR"},
+    {"Ukrainian", "UK"},
+    {"Chinese", "ZH"}
+  ],
+  target_langs: [
+    {"German", "DE"},
+    {"English British", "EN-GB"},
+    {"English American", "EN-US"},
+    {"Bulgarian", "BG"},
+    {"Czech", "CS"},
+    {"Danish", "DA"},
+    {"Greek", "EL"},
+    {"Spanish", "ES"},
+    {"Estonian", "ET"},
+    {"Finnish", "FI"},
+    {"French", "FR"},
+    {"Hungarian", "HU"},
+    {"Indonesian", "ID"},
+    {"Italian", "IT"},
+    {"Japanese", "JA"},
+    {"Lithuanian", "LT"},
+    {"Latvian", "LV"},
+    {"Dutch", "NL"},
+    {"Polish", "PL"},
+    {"Portuguese Brazilian", "PT-BR"},
+    {"Portuguese International", "PT-PT"},
+    {"Romanian", "RO"},
+    {"Russian", "RU"},
+    {"Slovak", "SK"},
+    {"Slovenian", "SL"},
+    {"Swedish", "SV"},
+    {"Turkish", "TR"},
+    {"Ukrainian", "UK"},
+    {"Chinese", "ZH"}
+  ]
+
+
 # Configures the endpoint
 config :outlook, OutlookWeb.Endpoint,
   url: [host: "localhost"],