Standardize and update code

scripts/contracts/email_expire_services_to_customers.php

@@ -154,10 +154,9 @@ if ($resql)
             // Define line content
             $outputlangs=new Translate('',$conf);
             $outputlangs->setDefaultLang(empty($obj->default_lang)?$langs->defaultlang:$obj->default_lang);	// By default language of customer
-            $outputlangs->load("bills");
-            $outputlangs->load("main");
-            $outputlangs->load("contracts");
-    		$outputlangs->load("products");
+
+            // Load translation files required by the page
+            $outputlangs->loadLangs(array("main", "contracts", "bills", "products"));
 
             if (dol_strlen($newemail))
             {

scripts/contracts/email_expire_services_to_representatives.php

@@ -127,10 +127,9 @@ if ($resql)
             // Define line content
             $outputlangs=new Translate('',$conf);
             $outputlangs->setDefaultLang(empty($obj->lang)?$langs->defaultlang:$obj->lang);	// By default language of sale representative
-            $outputlangs->load("bills");
-            $outputlangs->load("main");
-    		$outputlangs->load("contracts");
-            $outputlangs->load("products");
+
+            // Load translation files required by the page
+            $outputlangs->loadLangs(array("main", "contracts", "bills", "products"));
 
             if (dol_strlen($obj->email))
             {

scripts/invoices/email_unpaid_invoices_to_customers.php

@@ -151,8 +151,9 @@ if ($resql)
             // Define line content
             $outputlangs=new Translate('',$conf);
             $outputlangs->setDefaultLang(empty($obj->default_lang)?$langs->defaultlang:$obj->default_lang);	// By default language of customer
-            $outputlangs->load("bills");
-            $outputlangs->load("main");
+
+            // Load translation files required by the page
+            $outputlangs->loadLangs(array("main", "bills"));
 
             if (dol_strlen($newemail))
             {

scripts/invoices/email_unpaid_invoices_to_representatives.php

@@ -131,8 +131,9 @@ if ($resql)
             // Define line content
             $outputlangs=new Translate('',$conf);
             $outputlangs->setDefaultLang(empty($obj->lang)?$langs->defaultlang:$obj->lang);	// By default language of sale representative
-            $outputlangs->load("bills");
-            $outputlangs->load("main");
+
+            // Load translation files required by the page
+            $outputlangs->loadLangs(array("main", "bills"));
 
             if (dol_strlen($obj->email))
             {