News in 6.00.0, 2021-03-24 (not yet released)
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* API changes:
 - The TeplInfoBar class has been reworked.

* New API:
 - tepl_pango_font_description_to_css()
 - TeplLanguageChooser
 - TeplLanguageChooserWidget
 - TeplLanguageChooserDialog
 - TeplProgressInfoBar
 - Utility functions: add a few functions.

* Misc:
 - Translation updates.