fix(federations): reword invitations dialog title

[ShGKme]

☑️ Resolves

• Reword federation invitations dialog title to make it branding-neutral

🏁 Checklist

• 🌏 Tested with different browsers / clients:
  • Chromium (Chrome / Edge / Opera / Brave)
  • Firefox
  • Safari
  • Talk Desktop
  • Integrations with Files sidebar and other apps
  • Not risky to browser differences / client
• 🖌️ Design was reviewed, approved or inspired by the design team
• ⛑️ Tests are included or not possible
• 📗 User documentation in https://github.com/nextcloud/documentation/tree/master/user_manual/talk has been updated or is not required

[ShGKme]

/backport to stable34

[backportbot]

The backport to stable34 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable34
git pull origin stable34

# Create the new backport branch
git checkout -b backport/17321/stable34

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick f6656600

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/17321/stable34

Error: Failed to clone repository: Failed to create working tree: Preparing worktree (new branch 'backport/17321/stable34')
fatal: not a valid object name: 'origin/stable34'

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Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

[ShGKme]

/backport to stable33