5.2.1

1. Fix permissions of Hungarian translations file.
2. Rename Hungarian translation files from "hu-hu" to "hu"
3. Try to ensure random mixes have "safe" names by replacing any question mark, less/greater than, back/forward slashes, colon, or asterisk characters with underscores, and removing any semi-colon, single/double quote, tab, or new-line characters.
4. Fix empty home screen if random mix pinned and showing a list.
5. Add menu to 'Random Mix' dialog with option to pin start-mix dialog to home screen.