we refer to this command in the docs but the -v option is relatively
new and we do not mention it. While it still work without setting
that option it produces a ugly and potentially confusing warning.
Just fallback to "dev-build <local datetime>" in that case.
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
instead of creating a po file per source package
(that are: pmg-gui, proxmox-widget-toolkit and pve-manager),
but combine the messages from them and create one
po file per language.
to not include unneeded strings in the (pve|pmg)-lang-*.js files,
we use the references value in po2js.pl to filter out unwanted strings
also include a git submodule update in the 'update' target, so that
we get the newest version when updating the po file
