It should cache for an hour, I think (based on a quick look at nodebb package manager code). So yes - you have to wait a bit before the nbbpm refreshes. You can just install the updated version manually by using npm install <package name> from the command line in NodeBB folder.
Search with other language
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I just realize we use reds
It's good for English, I think.. But I need to support Chinese, and reds doesn't support it
For instance: try to search this thread using http://community.nodebb.org/search/%E4%B8%96%E7%95%8C
Any ideas to support search with other language?