feat(hyprland): add language tooltip format

[sato820]

Closes #3693

This adds tooltip support to hyprland/language.

• supports tooltip-format
• uses the same replacements as format: {long}, {short}, {shortDescription}, {variant}
• falls back to the visible layout text when tooltip-format is not set
• documents tooltip and tooltip-format in waybar-hyprland-language(5)

I could not compile Waybar in this Windows environment because no C++ compiler is installed here, but the implementation follows the existing sway/language tooltip pattern and the patch is limited to the Hyprland language module plus documentation.

[Alexays]

Closing as a duplicate — the hyprland/language module received many near-identical PRs adding tooltip support, so we're consolidating on #3698, the original and most complete implementation (it also supports per-language tooltips and an enable/disable toggle). No reflection on your work; we just can't merge the same feature many times. Thanks for contributing! 🙏