feat(guide): Starr language tips add German dual and multi (#1880)

* feat(guide): Starr language tips add German dual and multi

* fixed: url redirect failure

* Apply suggestions from code review

Co-authored-by: zakary <zak@ary.dev>

* Update docs/Radarr/Tips/How-to-setup-language-custom-formats.md

Co-authored-by: zakary <zak@ary.dev>

* Apply suggestions from code review

Co-authored-by: nuxen <theonenuxen@proton.me>

---------

Co-authored-by: zakary <zak@ary.dev>
Co-authored-by: nuxen <theonenuxen@proton.me>

docs/Radarr/Tips/How-to-setup-language-custom-formats.md

@@ -32,6 +32,10 @@ Add the following json to your Radarr/Sonarr with a score in your profile of `-1
     [[% filter indent(width=4) %]][[% include 'json/guide-only/language-not-original.json' %]][[% endfilter %]]
     ```
 
+!!! tip
+
+    Don't forget to take a look at [Language Special Cases](/Radarr/Tips/How-to-setup-language-custom-formats/#language-special-cases)
+
 ---
 
 ### Language: English Only
@@ -52,6 +56,10 @@ Add the following json to your Radarr/Sonarr with a score in your profile of `-1
     [[% filter indent(width=4) %]][[% include 'json/guide-only/language-not-english.json' %]][[% endfilter %]]
     ```
 
+!!! tip
+
+    Don't forget to take a look at [Language Special Cases](/Radarr/Tips/How-to-setup-language-custom-formats/#language-special-cases)
+
 ---
 
 ### Language: Multiple Only
@@ -80,8 +88,8 @@ Add the following json to your Radarr/Sonarr with a score in your profile of `-1
 
 ### Language: Prefer X but i'll take Y
 
-<sub><sub>Language: Not Original or German</sub>
+<sub><sub>Language: Not Original or German<br>
-<sub><sub>Language: Prefer German</sub>
+Language: Prefer German</sub>
 
 Let's say you want German, but if German is not available then fall back to Original language but don't accept any other translated languages.
 
@@ -103,6 +111,10 @@ Add the following json to your Radarr/Sonarr with a score in your profile of `10
     [[% filter indent(width=4) %]][[% include 'json/guide-only/language-prefer-german.json' %]][[% endfilter %]]
     ```
 
+!!! tip
+
+    Don't forget to take a look at [Language Special Cases](/Radarr/Tips/How-to-setup-language-custom-formats/#language-special-cases)
+
 ---
 
 ### Language: Prefer Language X
@@ -121,6 +133,10 @@ Add the following json to your Radarr/Sonarr with a score in your profile of `10
     [[% filter indent(width=4) %]][[% include 'json/guide-only/language-prefer-german.json' %]][[% endfilter %]]
     ```
 
+!!! tip
+
+    Don't forget to take a look at [Language Special Cases](/Radarr/Tips/How-to-setup-language-custom-formats/#language-special-cases)
+
 ---
 
 ### Language: Prefer Multi Language
@@ -145,6 +161,28 @@ Add the following json to your Radarr/Sonarr with a score in your profile of `10
 
 ---
 
+## Language Special Cases
+
+Here we will add special cases that often are related to specific languages.
+example: German Dual Language and/or Multi-language releases
+
+!!! info "In general, Dual/Multi in a release title stands for original language (*movies/show original language*) + foreign language(s). Which audio track is used for the first track isn't always known based solely on the naming."
+
+### Language: German + Original
+
+This Custom Format can be used in two ways:
+
+- If you **DON'T WANT** your media file to have a German audio track included, add this Custom Format with a score of `-10000`.
+- If you **PREFER** your media file to have a German audio track included, add this Custom Format with a positive score.
+
+<sub><sub>Language: German Dual Language</sub>
+
+??? example "JSON - [Click to show/hide]"
+
+    ```json
+    [[% filter indent(width=4) %]][[% include 'json/guide-only/language-german-and-original.json' %]][[% endfilter %]]
+    ```
+
 ## FAQ & INFO
 
 ### What's reverse scoring

docs/json/guide-only/language-german-and-original.json

@@ -0,0 +1,38 @@
+{
+  "trash_id": "guide-only",
+  "trash_scores": {
+    "default": -10000
+  },
+  "trash_description": "Language: German Dual and Multi language releases",
+  "name": "Language: German + Original",
+  "includeCustomFormatWhenRenaming": false,
+  "specifications": [
+    {
+      "name": "German",
+      "implementation": "LanguageSpecification",
+      "negate": false,
+      "required": true,
+      "fields": {
+        "value": 4
+      }
+    },
+    {
+      "name": "DL",
+      "implementation": "ReleaseTitleSpecification",
+      "negate": false,
+      "required": false,
+      "fields": {
+        "value": "(?<!WEB[-_. ]?)\\b(DL)\\b"
+      }
+    },
+    {
+      "name": "ML",
+      "implementation": "ReleaseTitleSpecification",
+      "negate": false,
+      "required": false,
+      "fields": {
+        "value": "\\b(ML)\\b"
+      }
+    }
+  ]
+}