in speech-to-text settings, implement language pinning

This is an implementation for pinning languages within the Speech-to-Text settings.

Users can pin/unpin languages by clicking an icon at the edge of each selectable language.
Dynamically displayed above the radio group of selectable languages. Users can select a pinned language at a glance.
Dynamic icon display with visual feedback and minimal visual clutter.
Reduces the effort needed to select a frequently used language.
Benefits users who need to quickly swap languages during conversations that involve many languages.
Localized.

naeruru / mimiuchi