* fix(image download servlet): avoid script execution

Covers [BPO-664](https://bonitasoft.atlassian.net/browse/BPO-664)

* avoid reading locale directly in the URL in GWT portal
This is to prevent GWT portal to strore an unsupported locale in the
cookie if it is passed in the URL _l param.

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

- use FINEST log level instead of FINE when the locale is reduced to
just the language

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

* fix(browser locale): Standardize browser locale logs

- improve log message in case of locale not available
- avoid retrieving the browser locale and logging for nothing the the
homepage servlet

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

* Reduce log level from INFO to FINE in LocaleUtils and PageServlet when
the behavior is expected and not useful as info in production.

covers [BR-565](https://bonitasoft.atlassian.net/browse/BR-565)

* add warning in profile quick/more details

Covers [BR-596](https://bonitasoft.atlassian.net/browse/BR-596)

* Reduce log level from INFO to FINE in LocaleUtils and PageServlet when
the behavior is expected and not useful as info in production.

covers [BR-565](https://bonitasoft.atlassian.net/browse/BR-565)

* Remove unused rule
* Remove configuration reload

covers [BPO-643](https://bonitasoft.atlassian.net/browse/BPO-643)

* 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)

- add new locales
- fix JSPI18n to log an error instead of trowing an exception if an
unknown locale is returned

covers [BPO-660](https://bonitasoft.atlassian.net/browse/BPO-660)

* 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`