Add tooltip formatting to hyprland language module

[keilogic]

Fixes #3693.

Summary

• add tooltip-format support to hyprland/language
• use the same {long}, {short}, {shortDescription}, and {variant} replacements supported by the module format
• fall back to the displayed label text when tooltip-format is not configured
• document tooltip and tooltip-format in waybar-hyprland-language(5)

Testing

• git diff --check

Note: I could not run a full Waybar build in this Windows environment because clang-format, meson, ninja, and a C++ compiler were not installed. The implementation mirrors the existing sway/language tooltip formatting path.

[keilogic]

Hi, just checking whether this tooltip-format approach fits the Hyprland language module direction. Happy to revise if you prefer a different formatting behavior.