Missing translation of recur_frequency_units
see row 789 of CRM/Contribute/Form/Contribution/Main.php
:
$unit .= "(s)";
$form->assign('frequency_unit', $unit);
It uses value
of recur_frequency_units
and not its label.
I think you could translate it at row 150 of templates/CRM/Contribute/Form/Contribution/Main.tpl
{if $one_frequency_unit}
{ts}{$form.frequency_interval.label}{/ts}
{else}
{ts}{$form.frequency_unit.html}{/ts}
{/if}
What do you think?