fix: logic of displaying enable/show/hide subtitle buttons

Maximilian Fußrequested to merge
m.fuss/web-app:3599-backport-subtitle-menu-buttons-control-logic-to-26-3-x-v2-10-x into release/v2.10.x

fix: logic of displaying enable/show/hide subtitle buttons

enable subtitle and show subtitle buttons are hidden if the feature is unavailable show subtitle button is disabled if subtitles are available but disabled

closes #3599 (closed)

(cherry picked from commit 114b02f7)

Closes #3599 (closed)

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