gettext not have dpgettext attribute when using python3.7

[eastonsuo]

Description

when using lower version of python, a error may be raised beacause python libraries is not compatiable with jupyterlab_server.

for example, when use gettext for translation, the dpgettext is add after python 3.7.

should there be some warning for use or do some code change for compatibility?

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[krassowski]

Thanks for reporting this issue, you are right this should not raise an error on 3.7! This was fixed in #213 - closing this one.