Manual:$wgNamespaceAliases

From MediaWiki.org

[edit] Details

These are alternate names for the primary localised namespace names, which are defined by $wgExtraNamespaces and the language file. If a page is requested with such a prefix, the request will be redirected to the primary name.

Set this to a map from namespace names to IDs. Example:

$wgNamespaceAliases = array(
        'Wikipedian' => NS_USER,
        'Help' => 100
    );

To add a single alias:

$wgNamespaceAliases['WP'] = NS_PROJECT;

[edit] Do not use space

Use underscores instead of spaces in namespace names. 'My Namespace' is an invalid name; use 'My_Namespace' instead.

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