[UI] Problem with "App category" button layout in env component page if category has long name

[Anastasia Kuznetsova]

Steps to reproduce:
1. Log in WebUI
2. Navigate to "Murano" > "Manage" > "Categories"
3. Create new category with long name, e.g "qqqq..qqqq"
4. Navigate to "Murano" > "Application Catalog" > "Environments"
5. Click on "App Category" button and select created category

Observed result:
"App Category" element "go down" (please take a look at attached screenshot)

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/205982

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/205982
Committed: https://git.openstack.org/cgit/openstack/murano-dashboard/commit/?id=5c0779d17f7720dd148bf3c73dd9c4068a12bb4a
Submitter: Jenkins
Branch: master

commit 5c0779d17f7720dd148bf3c73dd9c4068a12bb4a
Author: Antonio <email address hidden>
Date: Mon Jul 27 16:48:31 2015 +0800

    Fix "App category" dropdown button layout overflow

    When the name of category is too long, the button
    "App category" at the page "Murano" > "Application Catalog"
    > "Environments" display under the text "App category".

    To fix this bug, "max-width" is set to the button to limit the button's
    maximum size, "white-space" to set all whitespace to single whitespace,
    "overflow" to hide the overflow text, and "text-overflow" to ellipsis
    the overflow texts.

    Change-Id: Ib1599206bf3e50845c06a93ce6c20b926294e226
    closes-bug: #1475314