Index: binaries/data/mods/mod/gui/common/guitags.js
===================================================================
--- binaries/data/mods/mod/gui/common/guitags.js
+++ binaries/data/mods/mod/gui/common/guitags.js
@@ -1,3 +1,16 @@
+/*
+ * Set GUI tags on text string.
+ * @param {string} string - String to set tags around.
+ * @param {object} tags - Object with tags like { "color": "white" } or { "font": "sans-13" }.
+ * @return {string} - String surrounded by tags.
+ */
+function setStringTags(string, tags)
+{
+	for (let tag in tags)
+		string = '[' + tag + '="' + tags[tag] + '"]' + string + '[/' + tag + ']';
+	return string;
+}
+
 /**
  * Add color to text string.
  */
@@ -6,4 +19,36 @@
 	return '[color="' + color + '"]' + text + '[/color]';
 }
 
-//TODO: font setter
+/*
+ * Set color to string.
+ * @param {string} string - String to be colored.
+ * @param {string} color - Color for the string.
+ * @return {string} - String with color tag.
+ */
+function setStringColor(string, color)
+{
+	return setStringTags(string, { "color": color });
+}
+
+/*
+ * Set font to string.
+ * @param {string} string - String to set font.
+ * @param {string} font - Font name for the string.
+ * @return {string} - String with font tag.
+ */
+function setStringFont(string, font)
+{
+	return setStringTags(string, { "font": font });
+}
+
+/*
+ * Set font and color to string.
+ * @param {string} string - String to set font.
+ * @param {string} font - Font name for the string.
+ * @param {string} color - Color for the string.
+ * @return {string} - String with font and color setted.
+ */
+function setStringFontColor(string, font, color)
+{
+	return setStringTags(string, { "font": font, "color": color });
+}
Index: binaries/data/mods/mod/gui/modmod/modmod.js
===================================================================
--- binaries/data/mods/mod/gui/modmod/modmod.js
+++ binaries/data/mods/mod/gui/modmod/modmod.js
@@ -273,7 +273,7 @@
 		if (isDependencyMet(dependency))
 			continue;
 
-		guiObject.caption = coloredText(
+		guiObject.caption = setStringColor(
 			sprintf(translate('Dependency not met: %(dep)s'), { "dep": dependency }),
 			g_ColorDependenciesNotMet);
 
Index: binaries/data/mods/public/gui/common/tooltips.js
===================================================================
--- binaries/data/mods/public/gui/common/tooltips.js
+++ binaries/data/mods/public/gui/common/tooltips.js
@@ -1,8 +1,8 @@
 var g_TooltipTextFormats = {
-	"unit": ['[font="sans-10"][color="orange"]', '[/color][/font]'],
-	"header": ['[font="sans-bold-13"]', '[/font]'],
-	"body": ['[font="sans-13"]', '[/font]'],
-	"comma": ['[font="sans-12"]', '[/font]']
+	"unit": "sans-10",
+	"header": "sans-bold-13",
+	"body": "sans-13",
+	"comma": "sans-12"
 };
 
 var g_AttackTypes = {
@@ -84,22 +84,22 @@
 
 function bodyFont(text)
 {
-	return g_TooltipTextFormats.body[0] + text + g_TooltipTextFormats.body[1];
+	return setStringTags(text, { "font": g_TooltipTextFormats.body });
 }
 
 function headerFont(text)
 {
-	return g_TooltipTextFormats.header[0] + text + g_TooltipTextFormats.header[1];
+	return setStringFont(text, g_TooltipTextFormats.header);
 }
 
 function unitFont(text)
 {
-	return g_TooltipTextFormats.unit[0] + text + g_TooltipTextFormats.unit[1];
+	return setStringTags(text, { "font": g_TooltipTextFormats.unit });
 }
 
 function commaFont(text)
 {
-	return g_TooltipTextFormats.comma[0] + text + g_TooltipTextFormats.comma[1];
+	return setStringTags(text, { "font": g_TooltipTextFormats.comma });
 }
 
 function getSecondsString(seconds)
@@ -593,12 +593,10 @@
 	let formatted = [];
 	for (let resource in resources)
 		formatted.push(sprintf(translate("%(component)s %(cost)s"), {
-			"component": '[font="sans-12"]' + resourceIcon(resource) + '[/font]',
+			"component": setStringTags(resourceIcon(resource), { "font": "sans-12" }),
 			"cost": resources[resource]
 		}));
-	return coloredText(
-		'[font="sans-bold-13"]' + translate("Insufficient resources:") + '[/font]',
-		"red") + " " +
+	return setStringFontColor(translate("Insufficient resources:"), "sans-bold-13", "red") + " " +
 		formatted.join("  ");
 }