related to #1693 changed smarty version to 4.1.0

include/smarty/docs/designers/language-basic-syntax/language-math.md

@@ -0,0 +1,29 @@
+Math {#language.math}
+====
+
+Math can be applied directly to variable values.
+
+
+    {$foo+1}
+
+    {$foo*$bar}
+
+    {* some more complicated examples *}
+
+    {$foo->bar-$bar[1]*$baz->foo->bar()-3*7}
+
+    {if ($foo+$bar.test%$baz*134232+10+$b+10)}
+
+    {$foo|truncate:"`$fooTruncCount/$barTruncFactor-1`"}
+
+    {assign var="foo" value="`$foo+$bar`"}
+
+      
+
+> **Note**
+>
+> Although Smarty can handle some very complex expressions and syntax,
+> it is a good rule of thumb to keep the template syntax minimal and
+> focused on presentation. If you find your template syntax getting too
+> complex, it may be a good idea to move the bits that do not deal
+> explicitly with presentation to PHP by way of plugins or modifiers.