Correct HTML syntax error of messages

Fixed errors bellow,

-xml:lang property is required.
-Translation for (color) is not correct.
-Proposal to translate "warning.float-no-width"
-<?xml version="1.0" encoding="$output-encoding-name"?> is
required.
-<meta http-equiv='content-type' is required.
-<meta http-equiv="Content-Script-Type"
content="text/javascript" /> is required.
-<meta http-equiv="Content-Style-Type" content="text/css"
/> is required.
-Link for original object is valid only for "By URI".
-Width and height are required for <img>,
-<div></div> is not recommended.
-summary property is recommended for <table>.
-lang_choice is active only for "By URI".
-links should be separated by characters.

Attached file contains,
-Messages.properties.ja
-XHTML.properties
-Message.diff




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