Update english alt text for bank icon

[calexity]

• Line 227 Alt text can be: "Bank card with contactless symbol and checkmark"

benefits/benefits/locale/en/LC_MESSAGES/django.po

Line 227 in 1304855

msgstr "Image caption goes here"

• Line 201 Alt text can be: "Bank card with contactless symbol"

benefits/benefits/locale/en/LC_MESSAGES/django.po

Line 201 in 1304855

msgstr "Bank card icon"

• I can't find the error one but error icon alt text can be "Bank card with contactless symbol and question mark"

[thekaveman]

#11 is updated with the language and alt text.

I pushed 53c5448 and 6a35f47 with a bunch of updates for the images.

We still need alt text for the msgid "discounts.success.image" - the final sucess / call to action image on the last page (not the icon).

[thekaveman]

#11 is merged.