Update to release process template to cut beta for screenshots

[pljones]

• Finish App translations
  • Review translation PRs according to release process checklist
  • Wait for all PRs to be merged (missing translations will revert to English automatically).
  • Check for conflicting accelerator keys (see tools/checkkeys.pl)
• Finish Website translations
  • Wait for all PRs to be merged (missing translations will revert to English automatically)
  • Check for broken links

OK, so another thing we need to fix in the release process template is cutting another beta between Finish App translations and Finish Website translations so that the beta can be used for the screenshots.

Originally posted by @pljones in #3443