Offer only available options for printing: check format and language(s)

[kaare]

1.5.7

Trying to output an order to csv returns w/ no response. Turns out lsmb tries to fetch a template

SELECT * FROM "public"."template__get"('sales_order', NULL, 'csv')

which returns nothing.

csv option shouldn't be there if there's no way it'll work.

Any other way to download the order as csv? It's handy in some situations

[ehuelsmann]

See also #811 .

[ehuelsmann]

The solution to be developed should offer the available options by intersecting available formats with the available templates for said formats as well as the available languages (which can be calculated as "on-disk languages"(for the generic template)+"specific language templates").