Search by tag, not English characters

Probably not quite correctly search by tags. In this tag there are more than 300 topics.

Looked at other forums, the situation is similar.
v2.1.0.beta2 +382

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@maja can you investigate this issue?

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This has been fixed in:
https://github.com/discourse/discourse/commit/020eba46230c63795ae26890c7cb96d45548eab4

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