@NonNull
    public static String getTextAfterIndexUntil(final String text, final int idx, @Nullable final String endToken) {
        return getTextAfterIndexUntil(text, idx, endToken, -1);
    }
Convert a potentially HTML string into a plain-text one. If the string does not contain HTML markup,
it is returned unchanged.

@param html a string containing either HTML or plain text
@return a string without any HTML markup
main/src/main/java/cgeo/geocaching/utils/TextUtils.java