[BUG] Translation key Expenses.Groups.lastYear displayed instead of "Last Year"

[philipkbh]

On the "Expenses" page, the expense group headers are supposed to display properly translated strings like "This Week", "Earlier This Month", etc. However, for the "Last Year" group, the placeholder key Expenses.Groups.lastYear is displayed instead of the correct translation. This issue occurs in every language/locale.

Steps to Reproduce:

1. Navigate to the "Expenses" page.
2. Create a new expense with the expense date somewhere in the last year.
3. Observe that the text Expenses.Groups.lastYear is displayed instead of the proper translation.

Environment:

• Spliit app version: 1.14.1 (Docker image)
• Browser: FireFox 133.0.3

Screenshot: