[deleted] Thanks for sharing your thoughts. If what you suggest is that hashtags and Fof/discussion-language will not be compatible with each other. I did not use Fof/discussion-language, the language selector was for the default language of the whole forum, not for the discussions. I just installed Simplified Chinese language package.
The way I test it out is only turn on one language package:
1.English ON Simplified Chinese OFF (Scenario A)
The hashtag works perfect. Even though, the whole article is in Chinese, and the tag is in Chinese too.
2.Simplified Chinese ON English OFF (Scenario B)
The newly added hashtag won't have a search link on the tags. However, the previous added hashtag still works(when Chinese was turn off).
Then, I thought, I better bring this issue into attention. I guess if Scenario A works, then this extension shall work if the forum is using one language, for example, Simplified Chinese.