Prepare v4.0.0-beta3 release (#1588)

* Fix infinite scroll growth when publishing a website inside an iframe.

* Closes #1510 - Fix infinite scroll growth when publishing a website inside an iframe.

* Closes #1583 - Fix ABC notation viewer issues.

* Spanish translation revision.

* v4.0.0-beta3 changelog.

* Spanish translation revision.

* v4.0.0-beta3 licenses and changelog revision.

Fix Electron save dialog fallback and remember last selected filename (…

…#1488)

* Fix last saved filename

* Fix code

* Changelog revision

New languages: de, it. (#1362)

* New languages: Deutsch, Italiano.

* Spanish translation and ca, eo, eu, gl, pt, ro and va automatic translations.

* Release date revision.

* v3.0.x changelog file is no longer required.

* Adde auto-translations.

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Co-authored-by: Ernesto Serrano

Fix #795 - Display the correct name of the imported styles. (#796)

Update ChangeLog

Update package.json

Remove the sign tool options certificate information until the actions work with it.

Update ChangeLog

ChangeLog revision. (#559)

Prepare RC4 (#522)

* Fix untranslatable strings in TinyMCE templates.

* String extraction.

* Spanish translation revision.

* CA translation revision.

* VA translation revision.

* GL translation revision.

* EU translation revision.

* EO automated translation.

* Styles licenses revision.

* Update licenses list.

* Relate form fields and labels to improve accessibility.

* The style description required a higher `textarea`.

Merge pull request #506 from exelearning/hotfix/revert-fixture

Hotfix/revert fixture