Here is the area of the code refered to. Don'T see where I can change it:
'if ( is_network_admin() || !is_multisite() ) {
echo '<tr class="plugin-update-tr"><td colspan="' . $wp_list_table->get_column_count() . '" class="plugin-update colspanchange"><div class="update-message">';
if ( ! current_user_can('update_plugins') )
printf( __('There is a new version of %1$s available. View version %4$s details.'), $plugin_name, esc_url($details_url), esc_attr($plugin_name), $r->new_version );
else if ( empty($r->package) )
printf( __('There is a new version of %1$s available. View version %4$s details. Automatic update is unavailable for this plugin.'), $plugin_name, esc_url($details_url), esc_attr($plugin_name), $r->new_version );
else
printf( __('There is a new version of %1$s available. View version %4$s details or update automatically.'), $plugin_name, esc_url($details_url), esc_attr($plugin_name), $r->new_version, wp_nonce_url( self_admin_url('update.php?action=upgrade-plugin&plugin=') . $file, 'upgrade-plugin_' . $file) );
do_action( "in_plugin_update_message-$file", $plugin_data, $r );
echo '</div></td></tr>';'
I noticed problems since I added french on my blog.