Added FAQ

FAQ.md

@@ -335,6 +335,7 @@ Fonts, sizes, colors, etc should be material design whenever possible.
 * [(177) What does 'Sensitivity' mean?](#user-content-faq177)
 * [(178) Why are widgets not updating?](#user-content-faq178)
 * [(179) What are reply templates?](#user-content-faq179)
+* [(180) How do I use LanguageTool?](#user-content-faq180)
 
 [I have another question.](#user-content-get-support)
 
@@ -2248,7 +2249,8 @@ but even Google's Chrome cannot handle this.
 * Did you know that you can long press the folder name in the message header when viewing a conversation to navigate to the folder? (since version 1.1720)
 * Did you know that you can long press the add contact button in the message composer to insert a contact group? (since version 1.1721)
 * Did you know that you can long press the image action to show the image dialog, even if it was disabled? (since version 1.1772)
-* Did you know that you can long press the "] [" button to fit original messages to the screen width? (this might result in "thin" messages)
+* Did you know that you can long press the "] \[" button to fit original messages to the screen width? (this might result in "thin" messages)
+* Did you know that you can long press on the save drafts button for a grammar, style, and spell check?
 
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@@ -4752,6 +4754,16 @@ Templates can have the following options:
 
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+<a name="faq180"></a>
+**(180) How do I use LanguageTool?**
+
+After writing some text, you can long press on the save draft button to perform a grammar, style, and spell check via [LanguageTool](https://languagetool.org/).
+Texts with suggestions will be marked and if you tap on a marked suggestion,
+it will be shown by the keyboard if the keyboard supports this,
+else you can double tap or long press the marked text to show suggestions.
+
+<br />
+
 <h2><a name="get-support"></a>Get support</h2>
 
 &#x1F30E; [Google Translate](https://translate.google.com/translate?sl=en&u=https://github.com/M66B/FairEmail/blob/master/FAQ.md%23user-content-get-support)