Add Zotero.Utilities.Internal.stringWithColon() for localized colons

Generally just a colon, but, e.g., French adds a space before it. We'll
want to replace uses of `punctuation.colon` with this.

chrome/content/zotero/xpcom/utilities_internal.js

@@ -1561,6 +1561,18 @@ Zotero.Utilities.Internal = {
 	},
 	
 	
+	/**
+	 * Adds a localized colon to a string (which is usually just a colon, but, e.g., in French
+	 * there's a space before it)
+	 *
+	 * @param {String}
+	 * @return {String}
+	 */
+	stringWithColon: function (str) {
+		return Zotero.getString('punctuation.colon.withString', str);
+	},
+	
+	
 	resolveLocale: function (locale, locales) {
 		// If the locale exists as-is, use it
 		if (locales.includes(locale)) {

chrome/locale/en-US/zotero/zotero.properties

@@ -116,6 +116,7 @@ about.getInvolved = Want to help? [Get involved] today!
 punctuation.openingQMark		= “
 punctuation.closingQMark		= ”
 punctuation.colon				= :
+punctuation.colon.withString = %S:
 punctuation.ellipsis           = …
 
 install.quickStartGuide				= Zotero Quick Start Guide