> Is there any other alternative way for this

Break the message up?

If your message is "My device color is <div style="font-weight: 
bold">RED</div>." then write something like this:

<s:text  name="device.preamble">&nbsp;<div style="font-weight: bold">
<s:text  name="device.red"></div>.

where your properties file contains:
device.preamble=My device color is
device.red=RED

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