OO-639: fix some translations in OpenMeeting

src/main/java/org/olat/modules/openmeetings/ui/_i18n/LocalStrings_de.properties

@@ -23,7 +23,7 @@ openmeetings.title=OpenMeetings
 openmeetings.intro=Apache OpenMeetings v2.0 Konfiguration
 openmeetings.module.enabled=Modul "OpenMeetings"
 view=Ansehen
-table.empty=Kein Raum wurde nicht gefunden.
+table.empty=Kein Raum wurde gefunden.
 recording.name=Name
 recording.remove=M\u00F6chten Sie wirklich die Aufzeichnung "{0}" l\u00F6schen?
 recordings=Aufzeichnungen

src/main/java/org/olat/modules/openmeetings/ui/_i18n/LocalStrings_en.properties

@@ -149,7 +149,7 @@ rooms.title=Room
 start.hint=Select the button "$\:start.room" to participate in this meeting room. If available you can also watch recordings of previous meetings. Select the button "$\:recordings" to see the list of available recordings.
 start.room=Enter
 start.room.guest=Enter
-table.empty=No raum has been found.
+table.empty=No room has been found.
 users=Users
 users.description=The participant list displays a list of users that are currently in the meeting room. You can terminate the meeting session for each user at any time.
 users.empty=The room is still empty