Adds a footnote with a link to an instruction on how to flash Gluon onto
AVM routers.

Signed-off-by: David Bauer <mail@david-bauer.net>

The driver has stablized enough to officially support ramips-mt76x8 devices
again. At least remove BROKEN for VoCore 2 (as it was supported before).

The ramips-mt76x8 target is marked as BROKEN.

Signed-off-by: Christoph Krapp <achterin@googlemail.com>

I just followed this document on a Debian Stretch, and it worked out of
the box. So let's use Debian's current stable release here.

Signed-off-by: Christoph Krapp <achterin@googlemail.com>

Signed-off-by: Martin Weinelt <martin@darmstadt.freifunk.net>

fixes #1561

Before 7827f896, mandatory hostname field in config mode was
pre-filled with the default hostname.

This commit adds the config_mode.hostname.prefill option for
controlling the default value.

gluon-config-mode-geo-location-osm extends the
gluon-config-mode-geo-location with a location picker based on
OpenStreetMaps.

Based-on-patch-by: Jan-Tarek Butt <tarek@ring0.de>

As already done with other config mode texts, the altitude field now has
default texts that are used when they are not set in the site i18n files.
The altitude-help text has been removed from site i18n; instead, the
geo-location-help text now overrides the whole section description
including the part that mentions the altitude.