Concatenation in translatable string

[Stadly]

When translating long strings that can be pluralized, splitting the parts often improves readability (and compliance with maximum line length code style rules):

$translator->trans(
    'There must be at least one lower case letter.|'.
    'There must be at least %count% lower case letter.',
    ['%count%' => $constraint->getMin()]
);

instead of

$translator->trans(
    'There must be at least one lower case letter.|There must be at least %count% lower case letter.',
    ['%count%' => $constraint->getMin()]
);

The ContainerAwareTrans and ContainerAwareTransChoice extractors (I have not tested the others) do not recognize the string concatenation, but sets the message to null in the extracted translations.