Refactor: Reorganize country page headings for better clarity
Closes T405385
Summary
Reorganizes the country page template to improve visual hierarchy and clarity by restructuring headings.
Changes
- Changed main heading from "Country's copyright term" to just the country name
- Added "Copyright term" as a subheading before the copyright terms table
- Changed "Country's statistics" to "Public domain statistics" as a subheading
- Converted the statistics description text from h3 to paragraph for better visual hierarchy
Screenshots
Before
Before Shows "Canada's copyright term" as main heading and "Canada's statistics" as second heading

After
After Shows "Canada" as main heading with "Copyright term" and "Public domain statistics" as subheadings

Test plan
- Visit any country page (e.g., /country/Q16)
- Verify country name displays as main heading without possessive form
- Verify "Copyright term" appears as subheading above copyright terms table
- Verify "Public domain statistics" appears as subheading above statistics table
- Verify page structure is clearer and more organized