[Tickets #10457] Auto-detect locale support

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Ticket URL: http://bugs.horde.org/ticket/10457
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  Ticket             | 10457
  Created By         | Gunnar Wrobel <wrobel at pardus.de>
  Summary            | Auto-detect locale support
  Queue              | Horde Base
  Version            | Git master
  Type               | Enhancement
  State              | New
  Priority           | 1. Low
  Milestone          |
  Patch              |
  Owners             |
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Gunnar Wrobel <wrobel at pardus.de> (2011-08-26 09:40) wrote:

Horde 4 requires UTF-8 locales for the supported translations.  
Detecting the locales present is possible.

So we should:

1) Add a test for this in test.php so that the admin immediately sees  
which translations/charsets are actually available. This test should  
fail if there is no UTF-8 support in any locale.

2) We should disable the language selection on the login screen for  
languages not supported by the system.

3) We probably need an FAQ entry immediately then, to explain why some  
translations do not show up in the drop down list.

I briefly looked at the code to determine how this could be  
implemented. The main question I still had was how to cache the  
supported languages system wide within Horde_Core_Registry_Nlsconfig.  
But there is already a isValid($lang) method there that should allow  
to quickly add the required test infrastructure.