Fixed cost label for credit payments

[nesitor]

Fix: Put correct cost label for credit payment method.

Self proofreading checklist

• The new code clear, easy to read and well commented.
• New code does not duplicate the functions of builtin or popular libraries.
• An LLM was used to review the new code and look for simplifications.
• New classes and functions contain docstrings explaining what they provide.
• All new code is covered by relevant tests.

Changes

Changed cost label to Credits: if the payment method is

How to test

Execute the command aleph instance list with credit instances and check that payment pricing appears with Credits: instead %ALEPH:

[1yam]

LGTM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.23%. Comparing base (c84ea65) to head (93089b8).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #405      +/-   ##
==========================================
+ Coverage   61.21%   61.23%   +0.02%     
==========================================
  Files          20       20              
  Lines        3700     3702       +2     
  Branches      528      528              
==========================================
+ Hits         2265     2267       +2     
  Misses       1162     1162              
  Partials      273      273              

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