When a DOM node is passed to an HTML tooltip, the `title` node is only
moved if it is not already in the tooltip. Otherwise, `empty()` is used
instead of `detach()` before appending the `title` to avoid memory
leaks. If a DOM node is passed to a plain text tooltip, its text is
copied via jQuery `.text()`.

Replaces `.detach()` with `.empty()`, as `.detach()` is almost never
useful but instead leaks memory. The difference between `empty` and
`detach` is that the latter keeps all the attached jQuery events/data.
However, since we do not return the previous children, the user would
have to keep these themselves, thus they can `detach()` if necessary.

This is a port of https://github.com/twbs/bootstrap/pull/14552 to v4.

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1) Update it to v1.0.8
2) Include jekyll-search where it's used only

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Closes #17319 by merging it.

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And link to a relevant blog post w/ more info.
Refs #16966
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.visible-xs(-block) => .hidden-sm-up

Fixes #17263.
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Refs #17237
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I found non working anchors and some naming in consistency. I hope I fixed well. Have a nice day.

/cc @cvrebert

After v4.0.0 stable gets released, as existing translations get updated or completely new v4 translations get created, we can start adding entries back to the list.

http://v4.bootcss.com

Fixes grammatical erratum from cf7819d8