Export used to chose concept value by searching for label with the following
language code:

1. version specific (seda-2, seda-1 or seda-02)
2. seda
3. en

and crash if no matching label was found. But it seems we don't want it to crash
because we use some concept which has e.g. only a concept in 'fr' language code.
At some point we may want to improve this, depending on the relation (internal
seda vocabulary vs open vocabulary such as keyword reference), but for now,
let's add 'fr' to the expected language list and fallback to any language if
none has been found so the export doesn't fail.

Related to extranet #15934212