Quickly Resolvable Tech Debt

[ericdecanini]

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
  Audio files in the timeline now appear with the audio player #5586 (comment)

• 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
  Audio files in the timeline now appear with the audio player #5586 (comment)

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