Don't show Download button for Multi-Site
Fix build-release grunt task

Occasionally the build-release grunt task fails with the error
"... has no method 'endsWith'"
Using the latest version of the download npm module fixes this.
Load all translations with changeLocale

Currently, Localization::changeLocale loads only the core translations:
packages and site translations have to be loaded manually.
It's better to load all translations when switching the current locale,
since all the localization files should be considered as a whole.
Merge pull request #1724 from mlocati/fix-grunt-build-task

Fix build-release grunt task
Merge pull request #1722 from worldskills/fix-update-multi-site

Don't show download button for Multi-Site
Fix security report
https://hackerone.com/reports/7736
Merge branch 'load-all-translations-on-locale-change' of https://github.com/mlocati/concrete5 into mlocati-load-all-translations-on-locale-change
Update README.md
Update README.md