Improve export text and button

[lcduong]

This PR closes/references issue #171 . It does so by

• Update text for exporter
• fix QR generate

How has this been tested?

Checklist

• I have added tests to cover my changes.

Summary by Sourcery

Fix QR code generation and update text for various exporters and the 'Add to Calendar' button for improved clarity and user experience.

Bug Fixes:

• Fix QR code generation to ensure proper creation and display of QR codes.

Enhancements:

• Update verbose names for various exporters to more descriptive and user-friendly text.
• Change the 'Add to Calendar' button icon and text for better clarity.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request addresses issue #171 by updating the text for the exporter and fixing the QR code generation. The QR code generation logic in 'src/pretalx/common/exporter.py' has been revised to use a QRCode instance, and the image is now converted to a data URL. Additionally, the verbose_name attributes for various exporters in 'src/pretalx/schedule/exporters.py' have been updated to more user-friendly names. The button text and icon for adding events to the calendar in 'src/pretalx/agenda/templates/agenda/header_row.html' have also been changed.

File-Level Changes

Files	Changes
src/pretalx/schedule/exporters.py	Updated the verbose_name attributes for multiple exporters to improve clarity and user experience.

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[lcduong]

[sourcery-ai]

Hey @lcduong - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider adding tests to cover the new QR code generation functionality to ensure its correctness and prevent future regressions.
• It might be beneficial to profile the new QR code generation method to ensure it doesn't introduce any performance issues, especially if it's used frequently.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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