Incorrect message in role tooltip

[Julia Aranovich]

Steps to reproduce:
1. create efault env and go to Add Nodes screen
2. add zabbix node to the env, then go back to Add Nodes screen

Actual result: zabbix role will be locked (it's OK) and it's tolltip says that 1 node is already SELECTED. See an attached screenshot.

Expected result: tooltip message should tell that 1 node is already ASSIGNED/ADDED to the cluster.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/173801

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/173801
Committed: https://git.openstack.org/cgit/stackforge/fuel-web/commit/?id=ff184e5f7d1832b68ce284b54d0c14ea8da25add
Submitter: Jenkins
Branch: master

commit ff184e5f7d1832b68ce284b54d0c14ea8da25add
Author: Alexandra Morozova <email address hidden>
Date: Wed Apr 15 12:27:58 2015 +0200

    Role limit tooltip fix

     -cut translation to not show the number of selected nodes

    Closes-bug: #1442010

    Change-Id: I91f89086e57b420f432d1ef91ff90e19f2a7fa7d

[Anastasia Palkina (apalkina)]

Verified on ISO #323

"build_id": "2015-04-20_07-52-58", "ostf_sha": "4bab9b975ace8d9a305d6e0f112b734de587f847", "build_number": "323", "release_versions": {"2014.2-6.1": {"VERSION": {"build_id": "2015-04-20_07-52-58", "ostf_sha": "4bab9b975ace8d9a305d6e0f112b734de587f847", "build_number": "323", "api": "1.0", "nailgun_sha": "5a4556ea0cf943edffa33788994b7fb7abe150b3", "openstack_version": "2014.2-6.1", "production": "docker", "python-fuelclient_sha": "b4f1ddffd5263489090b65e662173e9e11aafd94", "astute_sha": "bf1751a4fe0d912325e3b4af629126a59c1b2b51", "feature_groups": ["mirantis"], "release": "6.1", "fuelmain_sha": "991fa8feca4afcf05ce85a1e7ebd7c7503b3f212", "fuellib_sha": "36f30ae7f19092a61eebb0522ca20d27468b4cbf"}}}, "auth_required": true, "api": "1.0", "nailgun_sha": "5a4556ea0cf943edffa33788994b7fb7abe150b3", "openstack_version": "2014.2-6.1", "production": "docker", "python-fuelclient_sha": "b4f1ddffd5263489090b65e662173e9e11aafd94", "astute_sha": "bf1751a4fe0d912325e3b4af629126a59c1b2b51", "feature_groups": ["mirantis"], "release": "6.1", "fuelmain_sha": "991fa8feca4afcf05ce85a1e7ebd7c7503b3f212", "fuellib_sha": "36f30ae7f19092a61eebb0522ca20d27468b4cbf"