[#23413231] Add BudgetItemLabel model. Refactor BudgetItem model to use BudgetItemLabel via the label FK field. Add other_extra field to BudgetItem to hold custom labels for budget items. Translation fixes.
[#23413231] Add BudgetItemLabel model. Refactor BudgetItem model to use BudgetItemLabel via the label FK field. Add other_extra field to BudgetItem to hold custom labels for budget items. Translation fixes.

akvo/akvo-rsr,akvo/akvo-rsr,akvo/akvo-rsr,akvo/akvo-rsr