Display the original string when translation key is present but translation is empty

Closes [BS-15651](https://bonitasoft.atlassian.net/browse/BS-15651)

- since 7.3 theme resources are accessed in a relative way using the URL
../theme. As a result, the path of the images declared in the CSS is
relative to the css directory in the theme so resources are not
retrieved from the war portal/ directory anymore.
We cannot remove them from there, though, because old forms look&feels
might still use them.
The solution is to just copy the two images we use inside the
appropriate directory in the theme.

Covers [BS-16006](https://bonitasoft.atlassian.net/browse/BS-16006)

Covers [BS-15868](https://bonitasoft.atlassian.net/browse/BS-15868)

Covers [BS-16221](https://bonitasoft.atlassian.net/browse/BS-16221)

replace servlet exception by error 401 when LoginFailedException was catch and redirect was false

Closes [BS-15873](https://bonitasoft.atlassian.net/browse/BS-15873)

- Call engine method to check if the user is a manager of an involved user when trying to display the overview form
- Make it configurable (inactive by default)

Covers [BS-16123](https://bonitasoft.atlassian.net/browse/BS-16123)

- Trigger contingency event on selectboxes when their available values
are updated as the first element in the list is automatically selected
- remove the support for triggering event on other widget's available
value update as this is never used in the code

Covers [BS-16050](https://bonitasoft.atlassian.net/browse/BS-16050)

When a JSON attribute value of type number is deserialized by Jackson,
it becomes an Integer and not a Long when it is small enough. However,
in the contract of the tasks and processes, we only support Long and ISO
String as input for a DATE contract input.
This commit adds the support for Integer

Covers [BS-16056](https://bonitasoft.atlassian.net/browse/BS-16056)

in 7.3+ when we update resources like rest api extension we need to
login to the platform (not nice...) when we are in local with the engine
there is no issue but in remote we need to have some system properties
set.
In that case it the login do not work we throw an exception with a
message that explain how to fix that.

Closes [BS-16035](https://bonitasoft.atlassian.net/browse/BS-16035)

Relates to [BS-14369](https://bonitasoft.atlassian.net/browse/BS-14369)

- add missing servlet mapping for the servlet called from pages in
custom profiles using ../API

Covers [BS-16009](https://bonitasoft.atlassian.net/browse/BS-16009)

- Avoid trying to get the human task after performing an update. This
is both useless (as we do not return the new object when performing a
PUT) and buggy (as the task may have already been archived if the update
was on its state)

Cover [BS-15981](https://bonitasoft.atlassian.net/browse/BS-15981)

Subscription forms jars built with maven 3.3.x have invalid maven
dependencies (community jars used for the shade are also part of the
transitive dependencies)

- use <optional>true<optional> to avoid that
- add missing dependencies to SP forms-server artifact

Covers [BS-16017](https://bonitasoft.atlassian.net/browse/BS-16017)

Closes [BS-16019](https://bonitasoft.atlassian.net/browse/BS-16019)

- add new filter mappings for the token validator filter
- do not filter the requests of type HEAD and GET (was already the case
for GET)

Covers [BS-16004](https://bonitasoft.atlassian.net/browse/BS-16004)

Enhance csrf filter to get csrf token from multipart form data

Relates to [BS-15832](https://bonitasoft.atlassian.net/browse/BS-15832)

Closes [BS-15818](https://bonitasoft.atlassian.net/browse/BS-15818)

- Support it using a new query string param "app" in URL The "referer"
header is used to retrieve this parameter in theme resources requests
- Default behavior when the "app" parameter is not present is to forward
to the portal theme

Covers [BS-15934](https://bonitasoft.atlassian.net/browse/BS-15934)