v2.4.3

### Release Notes

This is a patch release that fixes issues with the document font in the editor, viewer and manuscript preview on some Linux distros, and also fixes a potential crash on Windows when using the spell check dictionary install tool.

### Detailed Changelog

**Bugfixes**

* Fix a crash in the dictionaries install tool on Windows if the config folder reported by the third party Enchant spell checker tool didn't already exist prior to adding new dictionaries. The folder is now created when the tool is opened if it doesn't exist. Issue #1874. PR #1876.
* Fix issues setting a different text font for the editor and viewer, and related issues with the preview in the Manuscript Build tool, on certain platforms. Changing the font and setting non-standard font sizes produced unexpected results when reloading. The issue seems to be related to Qt 5.15.3, but that is not fully confirmed. However, the only place so far where the issue is observed is on Mint 21.3. Issues #1862 and #1875. PR #1877.