Transfer default content of user approve/decline email to approve/decline form #4630

[fae7em]

Related to #4630
What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• It's submitted to the develop branch, not the master branch if no hotfix
• When resolving a specific issue, it's referenced in the PR's description (e.g. Fix #xxx[,#xxx], where "xxx" is the Github issue number)
• All tests are passing
• New/updated tests are included
• Changelog was modified

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

Other information:

[luke-]

@fae7em Can you please change the Base Branch to Master? This is a fix and should included with the next version.

[fae7em]

@fae7em Can you please change the Base Branch to Master? This is a fix and should included with the next version.

Here is the new pull request:
#4652

[luke-]

@fae7em Thanks for the quick action!