Display competency level more consistently

[fbacall]

Summary of changes

• Displays competency level in: learning path topics index, learning path topic show page, material show page, workflow show page.
• Use label "Competency level" consistently across the site (in form, metadata and filter title)

Motivation and context

#1248

Screenshots

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]

Pull request overview

This PR addresses #1248 by making “Competency level” visible and consistently labeled across multiple resource pages (learning path topics, materials, workflows) and in facet/filter UI.

Changes:

• Adds/standardizes I18n labels for difficulty_level as “Competency level” (models + facet title).
• Displays competency level on learning path topic index/show cards and workflow cards.
• Adds difficulty_level to the shared “extra metadata” sidebar output and updates form labels to rely on I18n.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
config/locales/en.yml	Adds “Competency level” translations for model attributes and facet title.
app/views/workflows/_workflow.html.erb	Shows difficulty/competency level on workflow cards.
app/views/materials/_material.html.erb	Updates helper call to display competency level from difficulty_level.
app/views/materials/_form.html.erb	Removes hardcoded label to use I18n-driven “Competency level”.
app/views/learning_paths/show.html.erb	Updates difficulty display helper call for topics within a learning path.
app/views/learning_path_topics/show.html.erb	Adds a sidebar section displaying competency level for a topic.
app/views/learning_path_topics/_learning_path_topic.html.erb	Shows competency level on learning path topic index cards.
app/views/learning_path_topics/_form.html.erb	Removes hardcoded label to use I18n-driven “Competency level”.
app/views/common/_extra_metadata.html.erb	Adds difficulty_level to shared metadata rendering.
app/helpers/materials_helper.rb	Changes display_difficulty_level signature to accept a value directly.

Comments suppressed due to low confidence (1)

app/helpers/materials_helper.rb:62

• display_difficulty_level currently returns the raw stored ID (e.g. beginner) and returns an empty string for any other value (including the valid dictionary key notspecified). This leads to user-visible blanks (e.g. label rendered with no value) and is inconsistent with DifficultyDictionary titles (and HasDifficultyLevel indexing, which uses the title). Consider mapping IDs via DifficultyDictionary (e.g. use the entry title) and explicitly handling notspecified (either render “Not specified” or treat it as absent).

  def display_difficulty_level(value)
    if value == 'beginner'
      '• ' + value
    elsif value == 'intermediate'
      '•• ' + value
    elsif value == 'advanced'
      '••• ' + value
    else
      ''
    end

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