Answer to question http://www.question2answer.org/qa/38369/help-to-find-how-to-edit-popular-tags

qa-tag-cloud.php

function output_widget($region, $place, $themeobject, $template, $request, $qa_content)
{
	require_once QA_INCLUDE_DIR.'qa-db-selects.php';

	$populartags=qa_db_single_select(qa_db_popular_tags_selectspec(0, (int)qa_opt('tag_cloud_count_tags')));

	reset($populartags);
	$maxcount=current($populartags);

	$themeobject->output(
		'<h2 style="margin-top:0; padding-top:0;">',
		qa_lang_html('main/popular_tags'),
		'</h2>'
	);

	$themeobject->output('<div style="font-size:10px;">');

	$maxsize=qa_opt('tag_cloud_font_size');
	$scale=qa_opt('tag_cloud_size_popular');
	$blockwordspreg=qa_get_block_words_preg();

	foreach ($populartags as $tag => $count) {
		if (count(qa_block_words_match_all($tag, $blockwordspreg)))
			continue; // skip censored tags

		$size=number_format(($scale ? ($maxsize*$count/$maxcount) : $maxsize), 1);

		$uppercaseTag = function_exists('mb_strtoupper')
			? mb_strtoupper($tag, 'UTF-8')
			: strtoupper($tag);

		if (($size>=5) || !$scale)
			$themeobject->output('<a href="'.qa_path_html('tag/'.$uppercaseTag).'" style="font-size:'.$size.'px; vertical-align:baseline;">'.qa_html($tag).'</a>');
	}

	$themeobject->output('</div>');
}