Change name of high contrast theme to high contrast mode

Signed-off-by: Janis Köhr <janis.koehr@novatec-gmbh.de>

apps/accessibility/lib/AccessibilityProvider.php

@@ -67,9 +67,9 @@ class AccessibilityProvider {
 	public function getHighContrast() {
 		return [
 				'id'    => 'highcontrast',
-				'img'   => $this->urlGenerator->imagePath($this->appName, 'theme-highcontrast.jpg'),
-				'title' => $this->l->t('High contrast theme'),
-				'text'  => $this->l->t('A high contrast theme to ease your navigation. Visual quality will be reduced but clarity will be increased.')
+				'img'   => $this->urlGenerator->imagePath($this->appName, 'mode-highcontrast.jpg'),
+				'title' => $this->l->t('High contrast mode'),
+				'text'  => $this->l->t('A high contrast mode to ease your navigation. Visual quality will be reduced but clarity will be increased.')
 			];
 	}