register languages with help of a function. that enables advances functionality with fallback-language and makes it generally more robust.

this commit concludes the refactoring of the layout definition.

uhr-de.js

@@ -67,4 +67,4 @@ var layout = {
 		"12": {9:[7,8,9,10,11]}
 	}
 };
-window._uhr.languages['de'] = layout;
+window,_uhr.register('de', layout);

uhr-de_CH.js

@@ -93,4 +93,4 @@ var layout = {
 	}
 };
 // Das Layout bei der Uhr unter dem Code "de_CH" registrieren.
-window._uhr.languages['de_CH'] = layout;
+window,_uhr.register('de_CH', layout);

uhr-de_CH_genau.js

@@ -68,4 +68,4 @@ var layout = {
 		"12": {10:[1,2,3,4,5,6]}
 	}
 };
-window._uhr.languages['de_CH_genau'] = layout;
+window,_uhr.register('de_CH_genau', layout);

uhr-en.js

@@ -88,4 +88,4 @@ var layout = {
 		return hour;
 	}
 };
-window._uhr.languages['en'] = layout;
+window,_uhr.register('en', layout);

uhr.js

@@ -13,7 +13,7 @@ You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 (function($) {
-	"use strict";
+	'use strict';
 
 	if (window._uhr !== undefined) {
 		return;
@@ -22,7 +22,17 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 	window._uhr = {
 		id: 0,
 		languages: [],
-		themes: []
+		themes: [],
+		register: function(code, language) {
+			for (var i = 0; i < this.languages.length; i++) {
+				if (code == this.languages[i].code) {
+					console.error('Error: Language code ' + code + ' cannot be registered for language "' + language.language + '" because it is already registered for language "' + this.languages[i].language + '"!');
+					return false;
+				}
+			}
+			language.code = code;
+			this.languages.push(language);
+		}
 	};
 	// auto-detect themes
 	var styleSheets = $('head link[rel=stylesheet]');
@@ -148,7 +158,14 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 			}
 		},
 		_language: function() {
-			return window._uhr.languages[this.options.language];
+			for (var i = 0; i < window._uhr.languages.length; i++) {
+				var language = window._uhr.languages[i];
+				if (language.code == this.options.language) {
+					return language;
+				}
+			}
+			// fallback: return empty object
+			return {};
 		},
 		_highlight: function(itemClass) {
 			this.element.find('.item.' + itemClass).addClass('active');
@@ -228,17 +245,11 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 				e.after(toggleSwitch);
 
 				// language chooser
-				var options = [];
+				if (window._uhr.languages.length > 1) {
-				for (var code in window._uhr.languages) {
-					if (window._uhr.languages.hasOwnProperty(code)) {
-						var language = window._uhr.languages[code];
-						options.push('<option value="' + code + '">' + language.language + '</option>');
-					}
-				}
-				if (options.length > 1) {
 					var languageChooser = $('<select id="uhr-languagechooser' + this._id + '"></select>');
-					for (var i = 0; i < options.length; i++) {
+					for (var i = 0; i < window._uhr.languages.length; i++) {
-						languageChooser.append(options[i]);
+						var language = window._uhr.languages[i];
+						languageChooser.append('<option value="' + language.code + '">' + language.language + '</option>');
 					}
 					e.after(languageChooser);
 				}
@@ -282,6 +293,24 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 			if (selectedLanguage == undefined || this.options.force) {
 				selectedLanguage = this.options.language;
 			}
+			var found = false;
+			for (var i = 0; i < window._uhr.languages.length; i++) {
+				var code = window._uhr.languages[i].code;
+				if (selectedLanguage == code) {
+					found = true;
+					break;
+				}
+			}
+			if (!found) {
+				var fallback;
+				if (window._uhr.languages.length > 0) {
+					fallback = window._uhr.languages[0].code;
+				} else {
+					fallback = '';
+				}
+				console.warn("Language " + selectedLanguage + " not found! Using fallback: " + fallback);
+				selectedLanguage = fallback;
+			}
 			languageChooser.val(selectedLanguage);
 			this.options.language = "";
 			this.language(selectedLanguage);
@@ -295,7 +324,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 			if (selectedTheme == undefined || this.options.force) {
 				selectedTheme = this.options.theme;
 			}
-			var found = false;
+			found = false;
 			for (var i = 0; i < window._uhr.themes.length; i++) {
 				var styleClass = window._uhr.themes[i].styleClass;
 				if (selectedTheme == styleClass) {