SWORD1: intro.dxa not supported for non-english versions

[q-b]

Hi,

Sword1 cutscenes are available as extra downloads from the website (​https://www.scummvm.org/games/#addons-sword1:sword1) as DXA.

However, the new detection system mainly supports smackshi/intro.smk, with few exceptions (CS, PL, EN_ANY). ​https://github.com/scummvm/scummvm/blob/master/engines/sword1/detection_tables.h

Previously "patched" games in most languages (DE, ES, FR...) can no longer be added.

It results in a bunch of tickets : #14592 #14560 ...
One of them #14483 mention the need to copy back the smk file from the CD.

Either the error message should be clarified, or all the extra DXA files checksums added to the detection table...