Created global tag <release-21.02>. maintenance

Merged with default branch to prepare a new release. maintenance release-21.02

Released updated Spanish translations.

Eric 6 Spanish I18n update for default branch.

Added the forgotten documentation page.

Did some visual improvements.

MicroPython: improved the support for "BBC micro:bit" and "Calliope mini".

ViewManager: reverted a change testing type annotations.

Mercurial Shelve Extension: corrected the '--addremove' option.

Merged with Spanish translations update.

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