Add missing i18n tokens/texts related to View API Backend

[brylie]

Related to #965

Add missing i18n tokens/text related to all aspects of API Backend:

• View usage instructions (button)
  • Make API calls to:
• name of tabs
• Details
• Metadata
• Feedback
• Backlog
• Export
• Details view
• Delete (button)
• Just now

[brylie]

The status text and usage instructions had already been fixed in previous PRs.