Fix typo in Identifié

Fix typo

Downgrading to an old version of the mail gems, fixes problems with
umlauts.

Should use proper ERB syntax

Flakiness maybe due to fresh database?

add missing translation

fix #602

fix link to cfp

missing translation

Change creation date display to conference timezone

see #490

highlight late submissions

Event list pages recognize filters such as
event_type=demo|poster to match either
demo or poster.

A couple of models are changed to make sure the symbol "|"
is ised only as seperator and never as operand.

Add a modal window for multi-option filtering

Conflicts:
	app/assets/stylesheets/frab.css

Allow clicking on filter pane to edit filter details;

If multiple options are selected, the filter pane will
show "multiple" instead of enumerating the options
enabled.

Add "Clear filter" button to the filter modal

Improved event filters

see #566

More flexible mail templates

Before this change, a review metric starting with a digit will
convert to an sql term starting with a digit, which is not
acceptable SQL.

…arting_with_digit

allow review metrics starting with digit

This changes "my events" to be a special case of "all events",
with an additional query parameter "events=my"

The old URL for "my events" is now a redirection, for some backward
compatability. Old URLs for "my events" with filter or sort will
lose the filter/sort.

The benefit is that it will make bulk actions works seamlessly for
both views.

see #570

see #577

Add papertrail to event classifiers

Filter then email