Update l10n phrases related to email confirmation

[50U10FCA7]

Related to #413

Synopsis

Email confirmation now supports l10n.

Solution

Update fluent phrases namings related to email confirmation.

Additionally add fcm_webpush_link fluent phrase for WebPush link resolution.

Checklist

• Created PR:
  • [x] In draft mode
  • [x] Name contains issue reference
  • [x] Has type and k:: labels applied
• Before review:
  • [x] Documentation is updated (if required)
  • [x] Tests are updated (if required)
  • [x] Changes conform code style
  • [x] CHANGELOG entry is added (if required)
  • [x] FCM (final commit message) is posted or updated
  • [x] Draft mode is removed
• [x] Review is completed and changes are approved
  • [x] FCM (final commit message) is approved
• Before merge:
  • [x] Milestone is set
  • [x] PR's name and description are correct and up-to-date
  • [x] All temporary labels are removed

[50U10FCA7]

FCM

Update `UserEmail` confirmation related l10n phrases (#1022)

Additionally:
- add `fcm_webpush_link` l10n phrase