Merge pull request #299 from bandoulyes/master

XWIKI-10605 : Add internationalization support to send emails from a Template
XWIKI-10605 : Add internationalization support to send emails from a Template
* Minor improvements
XWIKI-10613: The Bootstrap license is missing.

* Since the license is not bundled in the webjar, we add it in our sources tree.

(cherry picked from commit 47dfb281a65bf56b7e70f5e6590993b3d94ca154)
XWIKI-10536: Capitalize first letter for buttons when adding a tag.

* Fix failing tests.

(cherry picked from commit b15e02b9613db944965bf6bbe64b8d7b18a6c36f)

Conflicts:
	xwiki-platform-core/xwiki-platform-tag/xwiki-platform-tag-test-pageobjects/src/main/java/org/xwiki/tag/test/po/AddTagsPane.java

(cherry picked from commit 5eaf298dc76e549a361d6f7aa293361d481f0b10)

Conflicts:
	xwiki-platform-core/xwiki-platform-tag/xwiki-platform-tag-test-pageobjects/src/main/java/org/xwiki/tag/test/po/AddTagsPane.java
XWIKI-10579: Upgrade to Bootstrap 3.2.0.
XWIKI-10615: Upgrade to HTML5Shiv 3.7.2.
XWIKI-10616: Fix some HTML5 violations in Flamingo.
XWIKI-10616: Fix some HTML5 violations in Flamingo.

* Revert unexpected change.
[misc] Reduce potential cross references
[misc] Remove properties copy/pasted by mistake
[misc] Update clirr excludes
XWIKI-10618: When importing a XAR it should be registered as extension only if it does not conflict with another extension
XWIKI-10577: Move wiki.css selectors to colibri.css.

* Remove call to a-non-existing-anymore-file in Flamingo
XWIKI-10622: Failure to get mail sending errors
XWIKI-10623: Mail sending should always work when "from" is not specified and use "admin_email" xproperty instead
XWIKI-10623: Mail sending should always work when "from" is not specified and use "admin_email" xproperty instead
* Generate a warning
XWIKI-10623: Mail sending should use the "admin_email" xproperty instead of "smtp_from"
* Revert changes that were not good

XWIKI-10625: Provide easy access to the Mail Sender API configuration from scripts
XWIKI-10621: Improve the User Profile on phone.
XWIKI-10623: Mail sending should use the "admin_email" xproperty instead of "smtp_from"
* Revert changes that were not good (forgot one)
XWIKI-10627: Failing to compute email subject from a template
+ minor reformating and javadoc improvements