The French one works, but not the en-GB one. Seems the en-GB one is simply too old (5.20, rather than 7.16) to work in the latest Drupal.
localize[/url] page] See if a translation of this Drupal version is available in your language of choice on the translation server. Not all languages are available for every version of Drupal, but if yours is available, follow these steps to install Drupal in your language:
Not available there. So, regardless of set environment, I feel it's not going to work in the language I desire. I tested the French one, and did get it work (regardless of set environment), because that one was available for the version of Drupal I was setting up (the latest, 7.16). The en-GB one is for version 5.20.
mark:$ echo $LANG
Again, the LANG environment made no difference, in spite of installing the en-GB version as per instructions (I reinstalled Drupal with the en-GB file, the .po file, chosen AFTER I had changed the LANG environment -- still no difference). The en-GB translation is too old.
The translation I was hoping for (en-GB) is not available for the latest Drupal (7.16). So, it's either Wordpress or Joomla, both of which do provide either en-CA or at least en-GB.
Server side software rarely looks at $LANG in my experience. These seems to be a frequent issue with drupal.
Did you try http://psdtucss.com/drupal/change-language-after-installation-in-drupal-6/ ?
I tried all of that along with a fresh install (as mentioned above). No luck.