fix: allow headers to be capitalized TASK-1174

[rgraber]

Summary

Allow capitalization of the 'label' and 'name' headers in an xls upload.

Notes

When an XLSForm is uploaded with capital letters in the label or name headers, interpret it the same as their lowercase counterparts. This fixes a ValueError on deploy, which was happening because the import didn't recognize the label column as one that doesn't expect translations.

Preview

Note: when switching between main and this branch in the formpack code, make sure to run pip-compile and pip install again.

1. clone this repo into your local copy of kpi
2. update kpi's requirements.in to use -e /container/path/to/kpi/formpack instead of the git address currently there
3. pip-compile dependencies/pip/requirements.in && pip-compile dependencies/pip/dev_requirements.in
4. pip install -r dependencies/pip/dev_requirements.txt
5. Create a project in kpi by uploading this form
   SimpleForm-copy.xlsx
6. Deploy the project
7. 🔴 [on main] Error. If you have debug mode on, it will say ValueError: "Label" column is not translated
8. 🟢 [on branch] Project deploys successfully

[coveralls]

coverage: 86.674%. remained the same
when pulling cb00206 on rsgraber/TASK-1174-allow-capital-label-header
into cc9aaf6 on main.