How ignore tags when use makemessages?

I have the following line:

Olá a todos <span class='myclass'>bem-vindos</span> ao site!

After using makemessages is generated the following lines in the '.po' file:

msgid "Olá a todos, <span class=\'myclass\'>bem-vindo</span>!"

msgstr ""

I repeat the span tag? Or is there a method to not appear in the translation file?

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