Fixed typo that crept in

CHANGELOG.md

core/FrontController.php

core/Piwik.php

core/Tracker/ScheduledTasksRunner.php

core/Translate.php

core/Translation/Translator.php

plugins/API/API.php

plugins/Actions/tests/Unit/ArchiverTest.php

plugins/Contents/tests/System/ContentsTest.php

plugins/Feedback/API.php

plugins/Insights/tests/Integration/ApiTest.php

plugins/Installation/Installation.php

plugins/ScheduledReports/API.php

tests/PHPUnit/Framework/Fixture.php

tests/PHPUnit/Framework/TestCase/SystemTestCase.php

tests/PHPUnit/Integration/CacheIdTest.php

tests/PHPUnit/Integration/ReportTest.php

tests/PHPUnit/Integration/Tracker/ActionTest.php

tests/PHPUnit/Integration/WidgetsListTest.php

tests/PHPUnit/Unit/Metrics/Formatter/HtmlTest.php