Update copyright date

The copyright must contain the first and last file modification date.
So if the file was created in 2013 and modified in 2014, the copyright
must be set accordindly.

Example:

Those changes were made by a script:

for FILE in $(git ls-files)
do
    # skip imported files

    FIRST=$(git log --pretty=format:%cd --date=short $FILE | cut -d - -f 1 | sort | uniq | head -1)
    LAST=$(git log --pretty=format:%cd --date=short $FILE | cut -d - -f 1 | sort | uniq | tail -1)
    if [ $FIRST -eq $LAST ]; then
        sed -i s/"Copyright.*"/"Copyright IBM, Corp. "$FIRST/g $FILE
    else
        sed -i s/"Copyright.*IBM.*"/"Copyright IBM, Corp. "$FIRST"-"$LAST/g $FILE
    fi
done

Signed-off-by: Aline Manera <alinefm@linux.vnet.ibm.com>
Add missing license headers

plugins/sample/ui/pages/i18n.json.tmpl, ui/css/theme-default/report-add.css
and ui/pages/help/kimchi.css was added to Kimchi source code without the
license header.
Fix it.

Signed-off-by: Aline Manera <alinefm@linux.vnet.ibm.com>