public String getTitle() {
        return LocalizationUtils.getString(this.resId);
    }
Minimal contrast ratio. If description:background contrast ratio is less than this value
for some string, foreground color will be removed and gray background will be used
in order to highlight the string

@see <a href="https://www.w3.org/TR/UNDERSTANDING-WCAG20/visual-audio-contrast-contrast.html">W3 Minimum Contrast</a>
main/src/main/java/cgeo/geocaching/utils/html/HtmlStyle.java