Merge changes from development

[rauenzi]

Includes all changes from #1635

Also includes:

• Moves all internal buttons to new Button component
• Uses internal modal stack only as a backup until a solution for rendering Discord's components is found
• Fixes the css editor using an ugly checkbox
• Debounces the live css update feature and fixes [Feature] A more memory efficient Custom CSS Live Update system #1645
• Removes outdated string terms and assets and fixes Update strings on POEditor #1651
• Also fixes some messages not being translated when translations existed also mentioned in Update strings on POEditor #1651