Kolibri-explore-plugin

<!-- Release notes generated using configuration in .github/release.yml at v6.41.0 -->

What's Changed
Changes
* build: Add i18n machinery by pwithnall in https://github.com/endlessm/kolibri-explore-plugin/pull/766
* NavBar: Add download button by jprvita in https://github.com/endlessm/kolibri-explore-plugin/pull/779
* template-ui: Make various UI strings translatable by pwithnall in https://github.com/endlessm/kolibri-explore-plugin/pull/774
* ek-components: Make various UI strings translatable by pwithnall in https://github.com/endlessm/kolibri-explore-plugin/pull/783
* Really fix featured channel icons on discovery page by dbnicholson in https://github.com/endlessm/kolibri-explore-plugin/pull/785


**Full Changelog**: https://github.com/endlessm/kolibri-explore-plugin/compare/v6.40.0...v6.41.0

<!-- Release notes generated using configuration in .github/release.yml at v6.40.0 -->

What's Changed
Changes
* PhET Simulations: Adjust header color by jprvita in https://github.com/endlessm/kolibri-explore-plugin/pull/767
* Fix featured channel icons on discovery page by dbnicholson in https://github.com/endlessm/kolibri-explore-plugin/pull/768


**Full Changelog**: https://github.com/endlessm/kolibri-explore-plugin/compare/v6.39.0...v6.40.0

<!-- Release notes generated using configuration in .github/release.yml at v6.39.0 -->

What's Changed
Changes
* Python backend testing by dbnicholson in https://github.com/endlessm/kolibri-explore-plugin/pull/763
* Download extra channels in the background by dbnicholson in https://github.com/endlessm/kolibri-explore-plugin/pull/762


**Full Changelog**: https://github.com/endlessm/kolibri-explore-plugin/compare/v6.38.0...v6.39.0

<!-- Release notes generated using configuration in .github/release.yml at v6.38.0 -->

What's Changed
Changes
* welcome-screen: Update background assets by jprvita in https://github.com/endlessm/kolibri-explore-plugin/pull/757


**Full Changelog**: https://github.com/endlessm/kolibri-explore-plugin/compare/v6.37.0...v6.38.0

<!-- Release notes generated using configuration in .github/release.yml at v6.37.0 -->

What's Changed
Changes
* Custom channel presentation: add also empty styles file. by erikos in https://github.com/endlessm/kolibri-explore-plugin/pull/758


**Full Changelog**: https://github.com/endlessm/kolibri-explore-plugin/compare/v6.36.0...v6.37.0

<!-- Release notes generated using configuration in .github/release.yml at v6.36.0 -->

What's Changed
Changes
* Custom channel presentation: add carousel for SAMHSA channel by erikos in https://github.com/endlessm/kolibri-explore-plugin/pull/755


**Full Changelog**: https://github.com/endlessm/kolibri-explore-plugin/compare/v6.35.0...v6.36.0