Bump ember-intl from 7.0.7 to 7.1.0 #1108

Job	Run time
Browser Stack Test (frontend, BS_OSX_Safari)	8m 3s
Browser Stack Test (frontend, BS_IOS_SAFARI)	7m 44s
Browser Stack Test (frontend, BS_CHROME_ANDROID)	9m 38s
Browser Stack Test (test-app, BS_OSX_Safari)	4m 41s
Browser Stack Test (test-app, BS_IOS_SAFARI)	4m 45s
Browser Stack Test (test-app, BS_CHROME_ANDROID)	5m 25s
Firefox Tests (frontend, latest-esr)	4m 10s
Firefox Tests (test-app, latest-esr)	2m 27s
Firefox Tests (lti-course-manager, latest-esr)	1m 2s
Firefox Tests (lti-dashboard, latest-esr)	1m 5s
Test and Capture Screenshots (frontend)	11m 21s
	1h 0m 21s

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