News in 40, 2021-03-19
----------------------------
* Remove all the deprecated API.
* file-browser: drop use of confirm-trash
* Translation updates.

Tepl-ification:
* Use tepl_pango_font_description_to_css().
* Use TeplLanguageChooser's.
* Use TeplProgressInfoBar.
* Start to use TeplBuffer and TeplFile APIs.
  As a result the new tabs are now named "Untitled File", not
  "Untitled Document".