* If there is a redirect param in the request use it otherwise check if
there is a redirect URL
* update keycloak config test example to remove logout url

This means it is no longer needed to put redirect=false in the request
to log in using the API. But previous login requests with a redirect URL
will continue working as the redirect parameter is optional

Covers [BPO-655](https://bonitasoft.atlassian.net/browse/BPO-655)

* fix(custom pages): follow install organization page renaming

Relates to [BR-474](https://bonitasoft.atlassian.net/browse/BR-474)
Closes [BR-491](https://bonitasoft.atlassian.net/browse/BR-491)

* fix(browser locale): Standardize browser locale (#608)

- move I18n class to original package to avoid possible breaks if
someone has been using it (although it is not part of the API) as it is
used in many tests

covers [BPO-543](https://bonitasoft.atlassian.net/browse/BPO-543)

- Keep only the browser locales that are accepted in the portal
- move i18n class from server to common module in order to be able to get the list of supported locales

covers [BPO-543](https://bonitasoft.atlassian.net/browse/BPO-543)

Content-Type header value contains the charset like this:

`Content-Type: text/html; charset=utf-8`

It was return a 415 error status due to a bad Content-Type parsing in
the Servlet.

In addition, the response should be `204 - No content` when `redirect`
parameter is `false`

* Add some JavaDoc for the class ControllerClassName

* fix(API process) Retrieve actor initiator id from cache

Covers [BS-19311](https://bonitasoft.atlassian.net/browse/BS-19311)

* fix(API process) Appli modification for ehcache 2.4.7

Covers [BS-19311](https://bonitasoft.atlassian.net/browse/BS-19311)
Covers [BS-19512](https://bonitasoft.atlassian.net/browse/BS-19512)

Covers [BS-19311](https://bonitasoft.atlassian.net/browse/BS-19311)

over the previous one.

* We do not compile REST API content at runtime anymore, instead we use
the jar provided in the REST API archive. So a REST API can be developed
in any JVM based language, it will work.

[BPO-578](https://bonitasoft.atlassian.net/browse/BPO-578)

in order to be able to use image upload in UID

covers [BPO-572](https://bonitasoft.atlassian.net/browse/BPO-572)

Covers [BS-19311](https://bonitasoft.atlassian.net/browse/BS-19311)

Covers [BS-19311](https://bonitasoft.atlassian.net/browse/BS-19311)

- Prevent page content from being cached in a custom profile

covers [BPO-506](https://bonitasoft.atlassian.net/browse/BPO-506)

* It is not possible to create an expression that returns null, so for
now, we return a 400 error if values are null

Closes BPO-539

Closes BPO-539