CI: skip spell checking src_classic

Assuming its not long for this mortal world (?).  Also check locales for
now.

Author: cbm755

.github/workflows/test_quick.yml

@@ -50,4 +50,6 @@ jobs:
           exclude_file: .codespell-ignorelines
           check_filenames: true
           check_hidden: true
-          skip: "*.pdf"
+          skip: "*.pdf,src_classic,locales"
+          # if we don't fix everything we can set this
+          # only_warn: 1