The pension-source form rendered raw enum codes (de_grv, de_renten, US…)
as the visible option text for the System, Tax treatment, and Country
selects — kind and payout_shape were the only ones mapped through t().
Add countries / pension_systems / tax_treatments label groups to the EN
locale (German domain terms preserved: GRV, bAV, Riester,
Besteuerungsanteil) and map the three selects through t() to match. DE
locale lands with the rest in PR4.