improve locator titles and groups visibility

[3nids]

improve locator titles and groups visibility by using bold text

before:

now:

former version of this PR:

[3nids]

I would be in favor of merging before tomorrow's release, but no strong opinion.

[github-actions]

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[nicogodet]

Just exposing my thoughts, in your example, I feel that Cantons, District should not be in bold font but instead italic and underlined ?
But I'm in favor for this change, I also find hard to distinguish locator form another

[3nids]

that would be like this

the fact that the spacing before the group is also underline is something to consider

[3nids]

I've played a bit more using a background alternate color for titles and groups and use the main text color for any text:

dark mode:

I've updated the main description with this screenshot.

[nicogodet]

the fact that the spacing before the group is also underline is something to consider

Indeed, not very satisfying.

I like the second proposal 😃