Fixes locales not working front end size

scripts/lua/locale.lua

@@ -1,7 +1,6 @@
 --
 -- (C) 2013-24 - ntop.org
 --
-
 local dirs = ntop.getDirs()
 package.path = dirs.installdir .. "/scripts/lua/modules/?.lua;" .. package.path
 package.path = dirs.installdir .. "/scripts/locales/?.lua;" .. package.path
@@ -12,12 +11,8 @@ local json = require "dkjson"
 -- ################################
 
 local info = ntop.getInfo(false)
-local lines = {
-   'Cache-Control: public, max-age=3600',
-   'Last-Modified: '..os.date("!%a, %m %B %Y %X %Z"),
-   'Server: ntopng '..info["version"]..' ['.. info["platform"]..']',
-   'Content-Type: text/javascript'
-}
+local lines = {'Cache-Control: public, max-age=3600', 'Last-Modified: ' .. os.date("!%a, %m %B %Y %X %Z"),
+               'Server: ntopng ' .. info["version"] .. ' [' .. info["platform"] .. ']', 'Content-Type: text/javascript'}
 
 print("HTTP/1.1 200 OK\r\n" .. table.concat(lines, "\r\n") .. "\r\n\r\n")
 
@@ -27,22 +22,31 @@ local language = _GET["user_language"] or "en"
 
 local main_language_path = require(language)
 
-if(language ~= "en") then
-   local alt_language_path = require("en")
+local function map_strings(main_language_path, alt_language_path)
+    -- Add missing strings using defaults (English)
+    for k, v in pairs(alt_language_path) do
+        if (main_language_path[k] == nil) then
+            main_language_path[k] = alt_language_path[k]
+        end
+        if type(main_language_path[k]) == "table" then
+            main_language_path[k] = map_strings(main_language_path[k], alt_language_path[k])
+        end
+    end
+    return main_language_path
+end
 
-   -- Add missing strings using defaults (English)
-   for k, v in pairs(alt_language_path) do
-      if(main_language_path[k] == nil) then
-	 main_language_path[k] = alt_language_path[k]
-      end
-   end  
+if (language ~= "en") then
+    local alt_language_path = require("en")
+    -- Add missing strings using defaults (English)
+    map_strings(main_language_path, alt_language_path)
 end
 local info = ntop.getInfo(true)
 main_language_path["ntopng_release_info"] = getNtopngRelease(info)
 
-print[[ const ntop_locale = ]] print(json.encode(main_language_path))
+print [[ const ntop_locale = ]]
+print(json.encode(main_language_path))
 
-print[[;
+print [[;
 
 function i18n(key) { 
     var fields = key.split('.');