ok, see I can wriggle out of this one..
Looking at the options available (and actually reading them properly for the first time..) I see 2, 3 and 4, 5 are exclusive.
HTML Code:
<option value="1">All Language Files for ENGLISH - Catalog/Admin</option>
<option value="2">All Main Language files - Catalog (/tienda_139a/includes/languages/english.php /espanol.php etc.)</option>
<option value="3">All Current Selected Language Files - /tienda_139a/includes/languages/english/*.php</option>
<option value="4">All Main Language files - Admin (/tienda_139a/admin/includes/languages/english.php /espanol.php etc.)</option>
<option value="5">All Current Selected Language Files - Admin (/tienda_139a/admin/includes/languages/english/*.php
1 - I read "All" as like er, everything - it doesn't do that, this is what confused me.
2 - looks in catalog, top-level primary language files only - works.
3 - looks in the rest of the catalog, subdirectory files, which is not really "All Currently Selected" (wriggling)
4 - looks in admin, english.php only - works ok
5 - as 3 but for admin.
So, I respectfully still think option 1 is not doing what it says on the tin.