Simplify saving to device

[rtibbles]

Summary

• Simplifies the logic for saving to device to remove attempt at IE11 compatibility
• Adds language information to disambiguate subtitle files, rather than using a slice of the checksum
• Updates version to 0.17.2

References

Fixes #12668

Reviewer guidance

Open a resource (preferable a KA video with lots of subtitles) and ensure in the info side panel that 'save to device' is working for several different files.

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Testing checklist

• Contributor has fully tested the PR manually
• If there are any front-end changes, before/after screenshots are included
• Critical user journeys are covered by Gherkin stories
• Critical and brittle code paths are covered by unit tests

PR process

• PR has the correct target branch and milestone
• PR has 'needs review' or 'work-in-progress' label
• If PR is ready for review, a reviewer has been added. (Don't use 'Assignees')
• If this is an important user-facing change, PR or related issue has a 'changelog' label
• If this includes an internal dependency change, a link to the diff is provided

Reviewer checklist

• PR is fully functional
• PR has been tested for accessibility regressions
• External dependency files were updated if necessary (yarn and pip)
• Documentation is updated
• Contributor is in AUTHORS.md

[github-actions]

Build Artifacts

Asset type	Download link
PEX file	kolibri-0.17.2.dev0_git.20240924214600.pex
Windows Installer (EXE)	kolibri-0.17.2.dev0+git.20240924214600-windows-setup-unsigned.exe
Debian Package	kolibri_0.17.2.dev0+git.20240924214600-0ubuntu1_all.deb
Mac Installer (DMG)	kolibri-0.17.2.dev0+git.20240924214600.dmg
Android Package (APK)	kolibri-0.17.2.dev0+git.20240924214600-0.1.4-debug.apk
TAR file	kolibri-0.17.2.dev0+git.20240924214600.tar.gz
WHL file	kolibri-0.17.2.dev0+git.20240924214600-py2.py3-none-any.whl

[pcenov]

Hi @rtibbles - I confirm that the 'Save to device' option is working correctly without issues for all supported files.

[marcellamaki]

code changes and manual QA checks out