OO-143: add missing key which result in a red screen

--HG--
branch : 80-patch

src/main/java/org/olat/course/nodes/projectbroker/_i18n/LocalStrings_jp.properties

@@ -7,6 +7,7 @@ chelp.projectbroker-editModules.title=$\:chelp.projectbroker.themenboerse \: \u9
 chelp.projectbroker-optionsCustomfields.title=$\:chelp.projectbroker.themenboerse \: \u30D5\u30A3\u30FC\u30EB\u30C9\u3092\u8FFD\u52A0\u3059\u308B
 chelp.projectbroker-optionsFormSettings.title=$\:chelp.projectbroker.themenboerse \u3092\u8A2D\u5B9A\u3059\u308B
 chelp.projectbroker.descriptionProjectAttachmentfilename=\u30D5\u30A3\u30FC\u30EB\u30C9 $\:detailsform.attachmentfilename.label \u5185\u306B\u30C8\u30D4\u30C3\u30AF\u4F5C\u6210\u8005\u306F\u30D5\u30A1\u30A4\u30EB\u3092\u30A2\u30C3\u30D7\u30ED\u30FC\u30C9\u3059\u308B\u3053\u3068\u304C\u3067\u304D\u307E\u3059\u3002
+chelp.projectbroker.themenboerse=Topic assignment
 detailsform.attachmentfilename.label=\u6DFB\u4ED8
 detailsform.remove.attachment=\u6DFB\u4ED8\u3092\u524A\u9664\u3059\u308B
 scoring.dropbox.rootfolder.name=\u30C9\u30ED\u30C3\u30D7\u30DC\u30C3\u30AF\u30B9

src/main/java/org/olat/course/nodes/projectbroker/_i18n/LocalStrings_pl.properties

@@ -21,6 +21,7 @@ chelp.projectbroker-optionsFormSettings.title=Konfiguracja
 chelp.projectbroker.customfieldAddFieldLinkCustomfieldNameLabel=W polu "$\:customfield.name.label" mo\u017Cesz wskaza\u0107 preferowan\u0105 nazw\u0119 pola.
 chelp.projectbroker.themaPl=W\u0105tki
 chelp.projectbroker.themaSg=W\u0105tek
+chelp.projectbroker.themenboerse=Topic assignment
 create.new.project.button=Utw\u00F3rz $\:chelp.projectbroker.themaSg
 customfield.add.field.link=Dodaj pole
 customfield.delete.link.0=Usu\u0144 pole