Also clears debian package from including *.js files from source roote folder, files which were not used.

Adds a placeholder which allows to write a plugin for executing some
code after the "load error handler" is triggered. A function named
"postLoadErrorHandler" should be defined in one of
the "#include virtual" files.

If the page reload value is not within specific range it will be
adjusted to a default of 10 seconds.

Also adds a link to reload manually.

The page will be reloaded if any of the mandatory scripts/resources
fails to load. The reload will be delayed with exponential backoff
starting from 2 seconds. The retry attempt counter is passed as
'rCounter' query attribute.

The commit adds an error listener which will replace the document body
with an error message if any of the files required for the app to
be displayed correctly fails to load.

Removing translateString forces using data-i18n attributes, to make sure we do not forget to set them. Missing data-i18n attributes is a problem with late loading where we can end up without translation, without text. Missing data-i18n attributes is also problem that strings will not be translated when changing language.
Fixes a bug in invite dialog, where remove password button was shown for non moderators.

Renames 'videoConnectionMessage' to 'localConnectionMessage', because
it is displayed when we're having problems with our local connection
and a different one will be shown for the remote connectivity issues.

Grey filter will be applied to the remote video/avatar displayed on
"large" and a message indicating remote connectivity issues will be
shown on top of that.