doc: updated changelog

doc/changelog.md

@@ -7,6 +7,7 @@ TWBlue Changelog
     * An option has been added to the global options dialog that allows for the reading of long posts in the graphical interface. This is especially useful since, by default, the graphical interface can only display a limited number of characters in the post.
     * Some options that are no longer necessary in the application have been removed from the global settings dialog.
 * Mastodon:
+    * A language selector has been added for posting in TWBlue. It is now possible to choose the language in which a post will be made, which will be useful for content filtering and other language-dependent features. The default language can be chosen based on your Mastodon account’s language, the language of the post you’re replying to, or, if no automatic selection is possible, TWBlue’s own language will be used by default.
     * fixed an error that caused TWBlue to not display some posts correctly.
     * Fixed name for community timelines when created during startup. Now it should be clear if it's a federated or local timeline.
     * Defined shortcuts to fields on the update profile dialog so it will be easier to navigate.