Add german translation for several validators (Greater/Equal/Less)
minor #9588 Add missing german translation for validators (Danez)

This PR was merged into the 2.3 branch.

Discussion
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Add missing german translation for validators

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #9575
| License       | MIT
| Doc PR        |

Some validators do not have german translation yet.

Commits
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11fd126 Add german translation for several validators (Greater/Equal/Less)