Add English Translation for Conf/Journal types

[ViGeng]

Except for the target category (types.yml), everything else is in English.

For consistency, shall we translate the category names (conference/types.yml) into English?
Or add extra English translation besides the Chinese names?

[jacklightChen]

Roughly speaking, most of our users are chinese, displaying the category names first seems to be a better choice. While we can add an i18n option for various users if any maintainer is willing to add the feature.

[ViGeng]

Yes, this is not emergent and important at all.
Unfortunately, I am not familiar with front-end techniques.
Let's see if anyone wants to take a try.