[cleanup] Removed some useless trailing spaces + fixed two typos

README.md

...veinstalls/server/script/ActiveInstallsScriptService.java

...s-server-ui/src/main/resources/ActiveInstalls/Counter.xml

...ui/src/main/resources/ActiveInstalls/JavaVersionsData.xml

.../main/resources/ActiveInstalls/XWikiVersionsCycleData.xml

...rc/test/it/org/xwiki/activeinstalls/test/ui/AllTests.java

...wiki/plugin/activitystream/api/ActivityEventPriority.java

...pn/xwiki/plugin/activitystream/api/ActivityEventType.java

...ki/plugin/activitystream/api/ActivityStreamException.java

...iki/plugin/activitystream/impl/ActivityStreamCleaner.java

.../plugin/activitystream/impl/ActivityStreamCleanerJob.java

...xpn/xwiki/plugin/activitystream/plugin/ActivityEvent.java

...ki/plugin/activitystream/plugin/ActivityStreamPlugin.java

...a/org/xwiki/administration/test/po/AdministrablePage.java

.../org/xwiki/administration/test/po/AdministrationPage.java

...iki/administration/test/po/AdministrationSectionPage.java

...ava/org/xwiki/administration/test/po/AnnotationsPage.java

...ration/test/po/GlobalRightsAdministrationSectionPage.java

.../java/org/xwiki/administration/test/po/GroupEditPage.java

...ain/java/org/xwiki/administration/test/po/GroupsPage.java