Add strings for post-setup onboarding guide component

[LianaHarris360]

Summary

This pr adds the reviewed strings for the Post-Setup Onboarding Guide component work to Kolibri.

Newly Added Strings:

• This is where you will find your downloaded channels and learning materials. You can also find and explore other people's libraries around you.
• You can explore someone else's library when you see this symbol.
• Open this menu to find other ways to use Kolibri.
• You can download learning materials from the Device page.
• Explore the folders in each channel to find more learning materials.
• Use filters to find learning materials by language, type of activity, or keywords.
• Use filters to find materials by language, activity, or keywords.
• Learn more about the material and download it to use anytime.
• Your downloaded channels and learning materials will be here. You can also find and explore the libraries on devices of other people around you.
• No channels yet. Start exploring libraries around you and find materials to add to your library.
• If there are any classes and materials currently available to you, they will appear on the home page.
• Learn more information about this material, download it for later use, and find related materials.

Pre-existing Strings:

• Add learning materials
• Skip
• Continue
• Choose materials to use on your device. You will also be able to add more whenever you are connected to the internet or there are other Kolibris around you.
• Welcome to the '{facility}' learning facility. Your class materials can be found on the home page.
• Use this filter to only see resources you have downloaded from this library.

References

Closes #12102

Reviewer guidance

• Review project strings found within the Figma specs.
• Verify that those strings have been correctly added to the file packages/kolibri-common/strings/kolibriOnboardingGuideStrings.js
• Verify that the new strings do not already exist in any other location within Kolibri.

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')

Reviewer checklist

• Automated test coverage is satisfactory
• 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[bot]]

Build Artifacts

Asset type	Download link
PEX file	kolibri-.pex
Windows Installer (EXE)	kolibri-0.16.1.dev0+git.20240503134542-unsigned.exe
Debian Package	kolibri_0.16.1.dev0+git.20240503134542-0ubuntu1_all.deb
Mac Installer (DMG)	kolibri-0.16.1.dev0+git.20240503134542-0.4.2.dmg
Android Package (APK)	kolibri-0.16.1.dev0+git.20240503134542-0.1.0-debug.apk
TAR file	kolibri-0.16.1.dev0+git.20240503134542.tar.gz
WHL file	kolibri-0.16.1.dev0+git.20240503134542-py2.py3-none-any.whl

[radinamatic]

We will do a final user strings review once the feature has been implemented, just noting that in this pre-existing string we should keep the terminology consistent and use the word material(s) instead of resource(s).

Use this filter to only see resources you have downloaded from this library.