recipe: Include UTF-8 fonts and use en_US.utf8

Previously we switched to non-utf8 locales because utf8 fonts were
missing. Now these fonts are added and we can switch back to utf8 again.
This fixes issues with the TUI.

Change-Id: I2d0050dcb42032fd5367a8abcbfad195dd420310
Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>