* 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)