Eased translationNodeVisitor overriding in TranslationExtension
merged branch tucksaun/patch-1 (PR #7952)

This PR was submitted for the 2.1 branch but it was merged into the master branch instead (closes #7952).

Discussion
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[TwigBridge] Make getNodeVisitors call getTranslationNodeVisitor()

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Applies to | 2.1+
| Tests pass?   | yes
| Fixed tickets | N/A
| License       | MIT
| Doc PR        | N/A

Commits
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20977e2 [TwigBridge] Eased translationNodeVisitor overriding in TranslationExtension