Provide Server-side service to support UI localization #265 (#322)

merging

webgoat-container/src/main/resources/i18n/messages_de.properties

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+#
+# This file is part of WebGoat, an Open Web Application Security Project utility. For details,
+# please see http://www.owasp.org/
+# <p>
+# Copyright (c) 2002 - 2017 Bruce Mayhew
+# <p>
+# This program is free software; you can redistribute it and/or modify it under the terms of the
+# GNU General Public License as published by the Free Software Foundation; either version 2 of the
+# License, or (at your option) any later version.
+# <p>
+# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# General Public License for more details.
+# <p>
+# You should have received a copy of the GNU General Public License along with this program; if
+# not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+# 02111-1307, USA.
+# <p>
+# Getting Source ==============
+# <p>
+# Source for this application is maintained at https://github.com/WebGoat/WebGoat, a repository for free software
+# projects.
+# <p>
+#
+
+#General
+LessonCompleted=Herzlichen Gl\u00fcckwunsch! Sie haben diese Lektion erfolgreich abgeschlossen.
+RestartLesson=Lektion neu beginnen
+SolutionVideos=L\u00f6sungsvideos
+ErrorGenerating=Fehler beim Generieren von
+InvalidData=Ung\u00fcltige Daten
+Go!=Los gehts!