Show what class is prev/next in class form

mods/ctf/ctf_modes/ctf_mode_classes/classes.lua

@@ -402,6 +402,16 @@ local function select_class(player, classname)
 	end
 end
 
+local function wrap_class(idx)
+	if idx > #class_list then
+		idx = 1
+	elseif idx < 1 then
+		idx = #class_list
+	end
+
+	return idx
+end
+
 function classes.show_class_formspec(player)
 	player = PlayerObj(player)
 	if not player then return end
@@ -429,6 +439,9 @@ function classes.show_class_formspec(player)
 			local class = context.class
 			local class_prop = class_props[class]
 
+			local next_class = class_props[class_list[wrap_class(table.indexof(class_list, class) + 1)]].name
+			local prev_class = class_props[class_list[wrap_class(table.indexof(class_list, class) - 1)]].name
+
 			return ctf_gui.list_to_formspec_str({
 				"formspec_version[4]",
 				{"size[%f,%f]", form_x, form_y+1.1},
@@ -441,8 +454,21 @@ function classes.show_class_formspec(player)
 					class_prop.name
 				},
 				{"box[0,%f;%f,0.8;#00000022]", bar_h-0.9, form_x},
+
 				{"image_button[0.1,%f;0.8,0.8;creative_prev_icon.png;prev_class;]", bar_h-0.9},
+				{"hypertext[1,%f;%f,1;classprev;<left><big><style color=#0DD>%s</style></big></left>]",
+					bar_h-0.7,
+					(form_x/2) - 1,
+					prev_class
+				},
+
 				{"image_button[%f,%f;0.8,0.8;creative_next_icon.png;next_class;]", form_x-0.9, bar_h-0.9},
+				{"hypertext[%f,%f;%f,1;classprev;<right><big><style color=#0DD>%s</style></big></right>]",
+					(form_x/2),
+					bar_h-0.7,
+					(form_x/2) - 1,
+					next_class
+				},
 
 				{"box[0.1,2.3;%f,%f;#00000077]", (form_x/2)-0.8, form_y-2.4},
 				{"model[0.1,2.3;%f,%f;classpreview;character.b3d;%s,blank.png;{0,160};;;]",