Add underline to the "contribute a translation" link

[obulat]

Fixes

Fixes #731 by @obulat

Description

This PR adds an underline to the "contribute a translation" link in the banner for locales where translations are not finished. Together with the recent addition of pink color to all links, this makes the call-to-action link standout.
This PR also renames the components to add the V prefix, syncs the code style of the components, and makes the padding the same as the header padding.

Testing Instructions

The simplest way to see the translation banner is to set v-show="!shouldHideBanner" to the opposite: v-show="shouldHideBanner" (without the ! in the condition).

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
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• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.

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[krysal]

The issue is solved with this. Thanks for standardizing the component names also!

I just wonder why I can´t see this change just visiting http://localhost:8443/nl-be/search/?q=vermillion for example? 🤔 Looks like another problem tho.

[krysal]

Does this dir need to be always "ltr"? Doesn't this change for the Arabic language for example?

[obulat]

I don't remember why this was added 🙈

[zackkrida]

The link looks nice! I do want to confirm, like @krysal suggested, that we're confident the banner is displaying when it should.