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Son Nguyen authored
1. During the exporting, put the error messages into $SESSION. 2. Refactor the displayMessages() function to display all messages or hide the previous one. 3. Refactor the function print_export_footer() to handle html code in lang strings. Change-Id: I589822dc360e8f5bcac0298f9534824513214160 Signed-off-by: Son Nguyen <son.nguyen@catalyst.net.nz>
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