Add tooltip-format to hyprland language module

[Chenhao-XU]

Fixes #3693

This adds tooltip formatting support to hyprland/language, matching the behavior users already have in similar language modules.

Changes:

• read optional tooltip-format from the module config
• format the tooltip with {long}, {short}, {shortDescription}, and {variant}
• fall back to the displayed layout text when no custom tooltip format is configured
• document tooltip-format and tooltip in waybar-hyprland-language(5)

Validation:

• git diff --check

Notes:

• I could not run a full local build in my Windows environment because Meson and the Linux/GTK/Wayland dependency stack are unavailable here.