Fix missing counter variable in singular form for correct pluralization

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Summary

The issue arises from the incorrect usage of singular strings where the counter variable is not applied, causing improper pluralization in languages with specific singular forms (e.g., 21, 31). The documentation mistakenly advises avoiding the use of %d or count variables in singular strings, leading to incorrect number display (typically 1). This issue addresses the problem by ensuring the counter variable is used correctly in singular forms to handle proper pluralization in all supported languages.

A documentation issue: Update i18n documentation on pluralization (gitlab-com/localization/localization-team#364).

Affected strings

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• InviteMembersModal|The following member couldn't be invited
• Todos|Restored 1 to-do
• Todos|Marked 1 to-do as done
• Todos|Removed snooze from 1 to-do
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Fixed

• Duration and timeago strings !185797 (merged)
• View all (one more item) !191372 (merged)

These strings need to be updated to correctly implement the counter variable for accurate pluralization in all relevant languages.

/cc @opysaryuk