[openstreetmap/openstreetmap-website] Switch to html5-compatible fragment encoding for wikipedia URLs (#3278)

[Andy Allan]

Fixes #3269

In the HTML4 days, fragments weren't allowed to have `%` signs, so mediawiki generated fragments with `%` replaced with a `.`

In HTML5, fragments can have % encoded characters, and so in 2017 wikipedia switched over to this for their automatically generated fragments, while keeping the "dot" versions available as a fallback.

However, we have been automatically converting all fragments, including manually specified anchors that do not have "dot"-encoded versions available. So we can now simplify everything by just using the HTML5 percent-encoded fragments.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/3278

-- Commit Summary --

  * Switch to html5-compatible fragment encoding for wikipedia URLs

-- File Changes --

    M app/helpers/browse_tags_helper.rb (2)
    M test/helpers/browse_tags_helper_test.rb (4)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/3278.patch
https://github.com/openstreetmap/openstreetmap-website/pull/3278.diff

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