How to change text in charts on Membership Account page

Hi again, on the Membership Account page, there are several tables displayed. In the first table it displays the Membership name, Status and Expires date. Is there a way to change the column head of "Membership name" to "Plan"?

I have the same situation in the Invoices table. I would like to change the column head of "Membership" to "Plan".

In the Activities table, under the Activity column, it shows copy that reads "Has signed up to membership...." I would like to change that copy to read "Has signed up to plan...."

I have the Ultimate Branding plugin installed and was able to accomplish this using the Find and Replace text function for the front end, but I'm thinking there is probably a better way to do it.

Thanks again for your help,
Trevor