Is a plus symbol without button text sufficient to denote adding of an item?

Let's say I'm using Bootstrap panels and I have these two choices:

Option A)

Option B)

Which option is better from a UX perspective? Is a plus symbol without button text sufficient to denote adding of an Item?

Note that we are internationalizing the application later, so there is some marginal cost to translating button text throughout the application. There are multiple panels on the application.

We're in a soft launch phase, so there isn't a huge pool of users we can survey.