Revert "don't html escape title attributes in vue, fixes #3050"

resources/vue/components/ActiveFilter.vue

resources/vue/components/AdminCourses.vue

resources/vue/components/ContentModulesControl.vue

resources/vue/components/ContentModulesEditTiles.vue

resources/vue/components/ContentmodulesEditTable.vue

resources/vue/components/EditableList.vue

resources/vue/components/FilesTable.vue

...ue/components/courseware/CoursewareContentPermissions.vue

...ents/courseware/tasks/CoursewareTasksDialogDistribute.vue

...omponents/courseware/tasks/TaskGroupsAddSolversDialog.vue

...ces/vue/components/courseware/unit/CoursewareUnitItem.vue

...vue/components/courseware/unit/CoursewareUnitProgress.vue

...s/vue/components/form_inputs/CalendarPermissionsTable.vue

...ces/vue/components/form_inputs/MyCoursesColouredTable.vue

resources/vue/components/questionnaires/InputArray.vue

resources/vue/components/tree/StudipTreeList.vue

resources/vue/components/tree/StudipTreeTable.vue

resources/vue/components/tree/TreeBreadcrumb.vue

resources/vue/components/tree/TreeCourseDetails.vue

resources/vue/components/tree/TreeNodeTile.vue