docs: add 103 changelog

metadata/en-US/changelogs/103.txt

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+- You can now filter notifications shown in the notification tab directly from the 'Filter notifications' button
+- Improvements for akkoma: translations, quoted posts will now be displayed correctly, and the ability to preview posts before publishing (Thanks Megalodon!)
+- Reach and Privacy settings now available in app
+- Option to disable underlined links
+- Using a Heart as a favorite icon is now possible
+- You can now copy crash logs in case you need to file a bug report
+- Added Bookmarks and Your favorites as pinnable timelines (Thanks Megalodon!)
+- You can now see the difference between the edited and original posts in the edit history (Thanks @FineFindus!)
+- Many small bug fixes