Placing donate button text update in useEffect hook

[cassiano]

Fixes #3667

Changes:

I have verified that this pull request:

• has no linting errors (npm run lint)
• has no test errors (npm run test)
• is from a uniquely-named feature branch and is up to date with the develop branch.
• is descriptively named and links to an issue number, i.e. Fixes #123
• meets the standards outlined in the accessibility guidelines

[cassiano]

I also increased the timeout to 500 ms, for precaution, and placed the donation logo image URL in a constant, avoiding repetition and keeping the code DRY.