Changing Japanese namespace names of MediaWiki
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Fragment of a discussion from Support/LiquidThreads
Probably the projects that use the Japanese language setting. Also you should check where the namespace names are used hardcoded in your wiki, for example changing {{#ifeq:{{NAMESPACE}}|ノート|...}}
to {{#ifeq:{{NAMESPACE}}|{{ns:Talk}}|...}}
or {{#ifeq:{{NAMESPACE}}|{{ns:1}}|...}}
, which will make the function work with both namespace names.