fix typo (#324)

Signed-off-by: sunxunle <sunxunle@gmail.com>

i18n/template/identity_parser.go

@@ -1,6 +1,6 @@
 package template
 
-// IdentityParser is an Parser that does no parsing and returns tempalte string unchanged.
+// IdentityParser is an Parser that does no parsing and returns template string unchanged.
 type IdentityParser struct{}
 
 func (IdentityParser) Cacheable() bool {