Changing case of language metadata causes errors

[Samuel Schluep]

The language metadata of the silva-meta set uses uppercase two-letter codes.
However, in general lowercase letters are used for the language. For example,
the Zope 3 i18n translator will not recognize uppercase language codes.

[Kit Blake (kitblake)]

I think the case of languages can be solved by the suggestion in this issue:
https://infrae.com/issue/silva/issue1475

I've added 'Silva-1.6,metadata' topics to that issue, and am
superceding/resolving this one. Could be that this is a bad idea, in which case
you can reply to this to reactivate it.

[Kit Blake (kitblake)]

This is tricky. In the process of changing Issue 1566 i wanted to get rid of the
lower() in the attribute, so I manually changed the case of the abbreviations in
the metadata set. And I got an error in the metadata screen.

Fortunately I could use the back button, set the language to none, (i.e. "Select
a Language") and then set it again. Thus, for the release documentation:

NOTE: If the language in your properties screen has been already set (probably
in your site root) you will get an error in that screen, after importing the
metadata set.
Error Type: KeyError
Error Value: 'Wrong item value [[EN]]'
You MUST first change the setting to none (i.e. "Select a Language") and save.
Then when you import the metadata set and reload the properties screen you can
set the language appropriately.

This will also be a problem with this issue's superceder. I'll duplicate this text.

Setting to testing for the time being so this issue is easier to find.

[Kit Blake (kitblake)]

Whoops, the superceder is 1475 (you can click it).

[Eric Casteleijn (thisfred)]

fixed in 1.5, 16 already has this

[Kit Blake (kitblake)]

Tested out ok in 1.5. This language setting will be a very useful feature.