Use modern Android layout keywords

[wizmer]

Contributor checklist

• [x] I have read the Contribution Guidelines
• [x] My commit messages follow the Conventional Commit Message Format
• [x] My contribution is fully baked and ready to be merged as is

---

Description

Layout keywords using the "left" or "right" term are now replaced by "start" or "end" in order to support right to left languages.

[passy]

That won't work unless we increase the min SDK version. Could you leave the old specifiers in there as well in addition to the new ones?