Hi experts,
I downloaded your brand new 2.3.1 and hoped that this will solve my problems with the backend language.
But it still doesn't work.
This is bad, as the docs now say SS should work with IIS 5.1 and greater.
I do have IIS6.
Everything else is working just fine.
But when I want to log in with an admin with default language = german I do get the following error
(this was also the case with 2.3.0)

[Warning] array_merge() [function.array-merge]: Argument #1 is not an array
GET /admin/security/
Line 14 in C:\inetpub\kunden\silverstripees\wwwroot\sapphire\lang\de_DE.php

Source
5 * @package sapphire
6 * @subpackage i18n
7 */
8
9 i18n::include_locale_file('sapphire', 'en_US');
10
11 global $lang;
12
13 if(array_key_exists('de_DE', $lang) && is_array($lang['de_DE'])) {
14    $lang['de_DE'] = array_merge($lang['en_US'], $lang['de_DE']);
15 } else {
16    $lang['de_DE'] = $lang['en_US'];
17 }
18
19 $lang['de_DE']['AdvancedSearchForm']['ALLWORDS'] = 'Alle Wörter';
20 $lang['de_DE']['AdvancedSearchForm']['ATLEAST'] = 'Wenigstens eines dieser Wörter';

TIA Stephan