Quickly Resolvable Tech Debt

These are just some minor code quality improvements discovered through conversations either on chats, while coding, or PR conversations that should be addressed where possible.

- `MessageComposerAction` includes actions that fall outside of the scope of message composition. In particular, these are concerned with audio controls and should be separated
https://github.com/vector-im/element-android/pull/5586#discussion_r843566494

- Comments in `strings.xml` should be above the corresponding line rather than beside it. This is because Weblate won't work on lines with comments
https://github.com/vector-im/element-android/pull/5586#discussion_r844935168

Feel free to add to this issue as seen fit. I'm creating this as a way for myself mostly to keep track of this debt but anyone should feel free to either add to this issue or to address the problems mentioned in it