Rename "Collaborators" "Maintainers" for learning paths & topics.

[fbacall]

Summary of changes

• Uses the term "Maintainers" instead of "Collaborators" for learning paths and topics.
• Extra i18n for collaborators view

Motivation and context

#1350

Checklist

• I have read and followed the CONTRIBUTING guide.
• I confirm that I have the authority necessary to make this contribution on behalf of its copyright owner and agree to license it to the TeSS codebase under the BSD license.

[Copilot]

🟡 Changes recommended

User-facing i18n strings introduced in en.yml contain grammar/spacing errors that should be fixed before merging.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

Renames the “Collaborators” UI label to “Maintainers” specifically for Learning Paths and Topics, and updates the collaborators modal to use i18n-backed strings so the wording can vary by resource type.

Changes:

• Add model-specific i18n attribute labels so collaborators renders as “Maintainers” for LearningPath and LearningPathTopic.
• Update Learning Path / Topic show sidebars and the shared collaborators modal button/header to use those i18n labels.
• Add controller tests asserting the UI shows “Maintainers” for Learning Paths and Topics.

File summaries

File	Description
test/controllers/learning_paths_controller_test.rb	Adds assertions that the collaborators UI is labeled “Maintainers” on learning path show.
test/controllers/learning_path_topics_controller_test.rb	Adds assertions that the collaborators UI is labeled “Maintainers” on topic show.
config/locales/en.yml	Adds attribute label overrides for learning paths/topics and new i18n strings for the collaborators modal.
app/views/learning_paths/show.html.erb	Switches sidebar heading to use LearningPath attribute translation for collaborators/maintainers label.
app/views/learning_path_topics/show.html.erb	Switches sidebar heading to use LearningPathTopic attribute translation for collaborators/maintainers label.
app/views/collaborations/_collaborators_button.html.erb	Makes the collaborators button/modal label and helper text driven by i18n + model attribute name.

Review details

Suppressed comments (1)

config/locales/en.yml:1206

• The collaborators info string is missing a space in “%{resource_type}owner”, which will render as e.g. “Learning pathowner”.

        the %{resource_type}owner can add and remove %{attribute}.

• Files reviewed: 6/6 changed files
• Comments generated: 1
• Review effort level: Lite

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