fix: fix various things to make main green (#628)

Author: InAnYan

en/.gitbook/includes/lets-take-the-file-field-f....md

@@ -2,7 +2,7 @@
 title: Let's take the file field f...
 ---
 
-```
+```plain
 Let's take the file field from this example entry:
 If we compare the field contents of the "{} biblatex source" tab (containing the raw bibtex data) with the fields contents in the "General" Tab` (the way how the data is represented), we can see a difference. The characters `:` and `:pdf` exist in "{} biblatex source" tab, but are not depicted in the General Tab:
 ```

en/advanced/entryeditor/add-entry-manually.md

@@ -8,7 +8,7 @@ Additionally, here the data is shown "as is", which means special symbols that a
 
 As an example, let's inspect the file field of this example entry:
 
-```
+```bibtex
 @Article{BennLazar2021www,
 author = {Benn, Claire and Lazar, Seth},
 date = {2021-09},

en/collect/newentryfromplaintext.md

@@ -10,22 +10,22 @@ Different parsers will lead to different results. It is strongly recommended to
 
 Example:
 
-```
+```plain
 O. Kopp, A. Armbruster, und O. Zimmermann, "Markdown Architectural Decision Records: Format and Tool Support", in 10th ZEUS Workshop, 2018.
 ```
 
-1.  Click Library and select "New entry from plain text..." Alternatively, you can press Ctrl+Shift+N.
+1. Click Library and select "New entry from plain text..." Alternatively, you can press Ctrl+Shift+N.
 
     <div align="left"><figure><picture><source srcset="../.gitbook/assets/Bild 1 - dark mode.jpg" media="(prefers-color-scheme: dark)"><img src="../.gitbook/assets/Bild 1.png" alt=""></picture><figcaption></figcaption></figure></div>
-2.  The "Plain Reference Parser" window opens
+2. The "Plain Reference Parser" window opens
 
     <div align="left"><figure><picture><source srcset="../.gitbook/assets/Bild 2 - Plain citations parser dialog opens - dark mode.png" media="(prefers-color-scheme: dark)"><img src="../.gitbook/assets/Bild 2 - Plain citations parser dialog opens - light mode.png" alt=""></picture><figcaption></figcaption></figure></div>
-3.  Paste the reference text:
+3. Paste the reference text:
 
     <div align="left"><figure><picture><source srcset="../.gitbook/assets/Bild 3 - paste text - dark mode (1).png" media="(prefers-color-scheme: dark)"><img src="../.gitbook/assets/new-entry-from-plain-text-step-3 (1).png" alt=""></picture><figcaption></figcaption></figure></div>
 4. Choose a parser from the drop-down menu.
 5. Click "Add to current library"
-6.  The result is selected in the entry table:
+6. The result is selected in the entry table:
 
     <figure><picture><source srcset="../.gitbook/assets/Bild 5 - rule based result is selected in entry table - dark mode.png" media="(prefers-color-scheme: dark)"><img src="../.gitbook/assets/Bild 5 - rule based result is selected in entry table - light mode.png" alt=""></picture><figcaption></figcaption></figure>