Download Notepad++
Use the 'Search in files' function
Search for Tag: ..or whatever other word you want to find in files ...
but in general ... it should be in ./wp-content/themes/twentyeleven/tag.php
change
<?php printf( __( 'Tag: %s', 'twentyeleven' ), '<span>' . single_tag_title( '', false ) . '</span>' ); ?>
to
<?php printf( __( 'Tag: %s', 'twentyeleven' ), '<span style="font-weight:700;">' . single_tag_title( '', false ) . '</span>' ); ?>
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