Fixes small typo

core/src/main/resources/org/apache/struts2/struts-messages_en.properties

@@ -31,7 +31,7 @@ struts.messages.invalid.file=Could not find a Filename for {0}. Verify that a va
 struts.messages.invalid.content.type=Could not find a Content-Type for {0}. Verify that a valid file was submitted.
 struts.messages.removing.file=Removing file {0} {1}
 struts.messages.error.uploading=Error uploading: {0}
-struts.messages.error.file.too.large=The file is to large to be uploaded: {0} "{1}" "{2}" {3}
+struts.messages.error.file.too.large=The file is too large to be uploaded: {0} "{1}" "{2}" {3}
 struts.messages.error.content.type.not.allowed=Content-Type not allowed: {0} "{1}" "{2}" {3}
 struts.messages.error.file.extension.not.allowed=File extension not allowed: {0} "{1}" "{2}" {3}