How to format string on I18n

Hello
I get the wrong message when type a string which needed to format
such as

msgid "An inviatation was sent to %(email)s."
msgstr "邀請已送到%(email)s"

------------------------------------------------------------------------------------------
Incorrect string value: '\xE9\x82\x80\xE8\xAB\x8B...' for column
'message' at row 1
------------------------------------------------------------------------------------------
How to fix it?
Thanks!!

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