Change "Make an Announcement"
Change "Make an Announcement"

This changes the wording on add Announcement button from
"Make an Announcement" to "+ Announcement"

fixes CNVS-17066

Test Plan:
- Go to Announcements
- If there are announcements, the button in the top left should now
say, + Announcements
- When there aren't announcements it should read, + Announcements on
the big blue button

Screenshots:

http://cl.ly/image/3D3t1A3j1O3b
http://cl.ly/image/2C2k0q2H290O

Change-Id: I43164db25480d5d21f8774cf0d0d66187245824b
Reviewed-on: https://gerrit.instructure.com/44774
Reviewed-by: Chris Hart <b82b40b84a2f06957ec9caf1768340bd6b929cc4@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
QA-Review: Anna Koalenz <8df3af669343a6e717fd7441a9deea414b21645f@instructure.com>
Product-Review: Colleen Palmer <387ba1943871e60965e6b44638a2f2e1ab9b8469@instructure.com>

venturehive/canvas-lms,whalejasmine/canvas-lms,juoni/canvas-lms,roxolan/canvas-lms,matematikk-mooc/canvas-lms,roxolan/canvas-lms,shidao-fm/canvas-lms,efrj/canvas-lms,grahamb/canvas-lms,instructure/canvas-lms,juoni/canvas-lms,venturehive/canvas-lms,utkarshx/canvas-lms,samuels410/greatlakes-lms,samuels410/greatlakes-lms,SwinburneOnline/canvas-lms,narigone/canvas,AndranikMarkosyan/lms,shidao-fm/canvas-lms,instructure/canvas-lms,dgynn/canvas-lms,ShreniiNepal/shrenii_lmp,snehakachroo1/LSI_replica,skmezanul/canvas-lms,eCNAP/CANVAS,wrdsb/canvas-lms,wrdsb/canvas-lms,SwinburneOnline/canvas-lms,roxolan/canvas-lms,instructure/canvas-lms,HotChalk/canvas-lms,HotChalk/canvas-lms,sdeleon28/canvas-lms,jay3126/canvas-lms,Rvor/canvas-lms,venturehive/canvas-lms,sdeleon28/canvas-lms,Jyaasa/canvas-lms,kyroskoh/canvas-lms,efrj/canvas-lms,fronteerio/canvas-lms,sfu/canvas-lms,redconfetti/canvas-lms,dgynn/canvas-lms,Rvor/canvas-lms,kyroskoh/canvas-lms,jay3126/canvas-lms,instructure/canvas-lms,samuels410/greatlakes-lms,shidao-fm/canvas-lms,Rvor/canvas-lms,greyhwndz/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,matematikk-mooc/canvas-lms,matematikk-mooc/canvas-lms,leftplusrightllc/canvas-lms,narigone/canvas,redconfetti/canvas-lms,juoni/canvas-lms,wrdsb/canvas-lms,skmezanul/canvas-lms,grahamb/canvas-lms,samuels410/greatlakes-lms,djbender/canvas-lms,greyhwndz/canvas-lms,whalejasmine/canvas-lms,fronteerio/canvas-lms,skmezanul/canvas-lms,redconfetti/canvas-lms,shidao-fm/canvas-lms,djbender/canvas-lms,roxolan/canvas-lms,fronteerio/canvas-lms,efrj/canvas-lms,kyroskoh/canvas-lms,wrdsb/canvas-lms,leftplusrightllc/canvas-lms,antoniuslin/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,leftplusrightllc/canvas-lms,SwinburneOnline/canvas-lms,tgroshon/canvas-lms,sdeleon28/canvas-lms,narigone/canvas,narigone/canvas,Jyaasa/canvas-lms,va7map/canvas-lms,matematikk-mooc/canvas-lms,redconfetti/canvas-lms,Jyaasa/canvas-lms,ShreniiNepal/shrenii_lmp,instructure/canvas-lms,greyhwndz/canvas-lms,AndranikMarkosyan/lms,AndranikMarkosyan/lms,tgroshon/canvas-lms,eCNAP/CANVAS,whalejasmine/canvas-lms,dgynn/canvas-lms,SwinburneOnline/canvas-lms,va7map/canvas-lms,va7map/canvas-lms,tgroshon/canvas-lms,efrj/canvas-lms,utkarshx/canvas-lms,fronteerio/canvas-lms,dgynn/canvas-lms,leftplusrightllc/canvas-lms,greyhwndz/canvas-lms,antoniuslin/canvas-lms,HotChalk/canvas-lms,snehakachroo1/LSI_replica,grahamb/canvas-lms,skmezanul/canvas-lms,tgroshon/canvas-lms,sdeleon28/canvas-lms,Rvor/canvas-lms,jay3126/canvas-lms,AndranikMarkosyan/lms,sfu/canvas-lms,grahamb/canvas-lms,djbender/canvas-lms,utkarshx/canvas-lms,juoni/canvas-lms,Jyaasa/canvas-lms,jay3126/canvas-lms,kyroskoh/canvas-lms,sfu/canvas-lms,utkarshx/canvas-lms,eCNAP/CANVAS,ShreniiNepal/shrenii_lmp,HotChalk/canvas-lms,antoniuslin/canvas-lms,grahamb/canvas-lms,ShreniiNepal/shrenii_lmp,whalejasmine/canvas-lms,antoniuslin/canvas-lms,snehakachroo1/LSI_replica,sfu/canvas-lms,eCNAP/CANVAS,venturehive/canvas-lms,va7map/canvas-lms,snehakachroo1/LSI_replica