Add error messages if construction of localization function fails.
Merge branch 'release/1.8' of https://github.com/openwebwork/webwork2 into release/2.8
Merge branch 'release/2.8' of https://github.com/openwebwork/webwork2 into release/2.8
Fix typo in ProblemGrader. Add File::Find::Rule module to check_modules
Merge pull request #230 from mgage/release/2.8_minor_changes

Release/2.8 minor changes -- merge this first.

Small changes.   The pull request compiles and seems to run.