AdminLTE3 optimizations & compression and caching

- fixed copy of qemu-arm-static for alpine
- added 'set -eu' safeguard
- silenced npm update notification
- added color to webpack call
- changed Admin-LTE default blue
  (core/admin/Dockerfile)

- AdminLTE 3 style tweaks
  (core/admin/assets/app.css)
  (core/admin/mailu/ui/templates/base.html)
  (core/admin/mailu/ui/templates/sidebar.html)

- localized datatables
  (core/admin/Dockerfile)
  (core/admin/assets/app.js)
  (core/admin/package.json)

- moved external javascript code to vendor.js
  (core/admin/assets/app.js)
  (core/admin/assets/vendor.js)
  (core/admin/webpack.config.js)

- added mailu logo
  (core/admin/assets/app.js)
  (core/admin/assets/app.css)
  (core/admin/assets/mailu.png)

- moved all inline javascript to app.js
  (core/admin/assets/app.js)
  (core/admin/mailu/ui/templates/domain/create.html)
  (core/admin/mailu/ui/templates/user/create.html)

- added iframe display of rspamd page
  (core/admin/assets/app.js)
  (core/admin/mailu/ui/views/base.py)
  (core/admin/mailu/ui/templates/sidebar.html)
  (core/admin/mailu/ui/templates/antispam.html)

- updated language-selector to display full language names and use post
  (core/admin/assets/app.js)
  (core/admin/mailu/__init__.py)
  (core/admin/mailu/utils.py)
  (core/admin/mailu/ui/views/languages.py)

- added fieldset to group and en/disable input fields
  (core/admin/assets/app.js)
  (core/admin/mailu/ui/templates/macros.html)
  (core/admin/mailu/ui/templates/user/settings.html)
  (core/admin/mailu/ui/templates/user/reply.html)

- added clipboard copy buttons
  (core/admin/assets/app.js)
  (core/admin/assets/vendor.js)
  (core/admin/mailu/ui/templates/macros.html)
  (core/admin/mailu/ui/templates/domain/details.html)

- cleaned external javascript imports
  (core/admin/assets/vendor.js)

- pre-split first hostname for further use
  (core/admin/mailu/__init__.py)
  (core/admin/mailu/models.py)
  (core/admin/mailu/ui/templates/client.html)
  (core/admin/mailu/ui/templates/domain/signup.html)

- cache dns_* properties of domain object (immutable during runtime)
  (core/admin/mailu/models.py)
  (core/admin/mailu/ui/templates/domain/details.html)

- fixed and splitted dns_dkim property of domain object (space missing)
- added autoconfig and tlsa properties to domain object
  (core/admin/mailu/models.py)

- suppressed extra vertical spacing in jinja2 templates
- improved accessibility for screen reader
  (core/admin/mailu/ui/templates/**.html)

- deleted unused/broken /user/forward route
  (core/admin/mailu/ui/templates/user/forward.html)
  (core/admin/mailu/ui/views/users.py)

- updated gunicorn to 20.1.0 to get rid of buffering error at startup
  (core/admin/requirements-prod.txt)

- switched webpack to production mode
  (core/admin/webpack.config.js)

- added css and javascript minimization
- added pre-compression of assets (gzip)
  (core/admin/webpack.config.js)
  (core/admin/package.json)

- removed obsolte dependencies
- switched from node-sass to dart-sass
  (core/admin/package.json)

- changed startup cleaning message from error to info
  (core/admin/mailu/utils.py)

- move client config to "my account" section when logged in
  (core/admin/mailu/ui/templates/sidebar.html)

core/admin/mailu/ui/forms.py

@@ -88,7 +88,7 @@ class UserForm(flask_wtf.FlaskForm):
     localpart = fields.StringField(_('E-mail'), [validators.DataRequired(), validators.Regexp(LOCALPART_REGEX)])
     pw = fields.PasswordField(_('Password'))
     pw2 = fields.PasswordField(_('Confirm password'), [validators.EqualTo('pw')])
-    quota_bytes = fields_.IntegerSliderField(_('Quota'), default=1000000000)
+    quota_bytes = fields_.IntegerSliderField(_('Quota'), default=10**9)
     enable_imap = fields.BooleanField(_('Allow IMAP access'), default=True)
     enable_pop = fields.BooleanField(_('Allow POP3 access'), default=True)
     displayed_name = fields.StringField(_('Displayed name'))