Set TERM to reflect colours support

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
Merge remote-tracking branch 'origin/wip/term'

* origin/wip/term:
  Set TERM to reflect colours support
use cleanup

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
make TERM configurable

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
update french translation

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
less casts

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
remove support for background image

this is deprecated upstream

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>