in epiphany/po/uk.po:

#. Translators: The text before the "|" is context to help you decide on
#. * the correct translation. You MUST OMIT it in the translated string.
#. * Translators: the first %s is the language name, and the
#. * second %s is the locale name. Example:
#. * "French (France)"
#.
#. Translators: The text before the "|" is context to help you decide on
#. * the correct translation. You MUST OMIT it in the translated string.
#: ../src/prefs-dialog.c:997 ../src/prefs-dialog.c:1005
#, c-format
msgid "language|%s (%s)"
msgstr "|%s (%s)"

The "|" character should have been removed from the translated string.