Make language list more accessible

[foxbunny]

• Fix the button markup (change A to BUTTON)
• Add lang attribute as appropriate
• Expand the ARIA label for the menu button (NOTE: i18n needed)
• Increase target surface area of the language buttons

Fixes #5899

[foxbunny]

For now I'm going to leave the conversion to a <form> alone. I'll first convert the session bar into a pull-down menu as we've discussed, and then I'll circle back to this.

[ThiefMaster]

Besides those small issues it looks and works really well though! Only thing I'd look into is changing the padding/margin of the individual language entries a bit, they feel larger than before.

[ThiefMaster]

Only thing I'd look into is changing the padding/margin of the individual language entries a bit, they feel larger than before.

Just noticed that this is likely intentional ("Increase target surface area of the language buttons") so nevermind.

[foxbunny]

Besides those small issues it looks and works really well though! Only thing I'd look into is changing the padding/margin of the individual language entries a bit, they feel larger than before.

This is to increase their target size. Since we're not touching font sizes as of right now, it looks larger than it should be. Ideally I would also increase the font size.