add subtitle/closed caption icons #1342

Job	Run time
Style (ubuntu-latest)	1m 0s
Style (macos-latest)	54s
Code Coverage (ubuntu-latest)	1m 57s
Container Build (ubuntu-latest, loongarch64-unknown-linux-gnu, loong64)	15m 11s
Style (windows-latest)	1m 50s
Build (ubuntu-latest, arm-unknown-linux-gnueabihf, use-cross)	3m 27s
Build (ubuntu-latest, aarch64-unknown-linux-gnu, use-cross)	3m 29s
MinSRV	55s
Build (ubuntu-latest, aarch64-unknown-linux-musl, use-cross)	3m 55s
Build (ubuntu-latest, i686-unknown-linux-gnu, use-cross)	3m 14s
Build (ubuntu-latest, i686-unknown-linux-musl, use-cross)	3m 18s
Build (ubuntu-latest, x86_64-unknown-linux-gnu, use-cross)	3m 7s
Build (ubuntu-latest, x86_64-unknown-linux-musl, use-cross)	3m 11s
Build (macos-latest, x86_64-apple-darwin)	2m 9s
Build (macos-latest, aarch64-apple-darwin)	1m 35s
Build (windows-latest, i686-pc-windows-gnu)	3m 51s
Build (windows-latest, i686-pc-windows-msvc)	6m 12s
Build (windows-latest, x86_64-pc-windows-gnu)	6m 50s
Build (windows-latest, x86_64-pc-windows-msvc)	5m 35s
	1h 11m 40s

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