Commit e30823bb authored by Adrien Plazas's avatar Adrien Plazas Committed by Guido Gunther

preferences-group: Use the h4 style class

Use the h4 style class instead of hardcoding the bold style for the
preferences group title, and implement a fallback making the font bold.

This is needed by elementary to use their own style.
parent 3270b089
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