Indent text with single spaces.

        Parameters
        ----------
        :param text : string
            The text which get a specific indentation.
        :param n_indents : int, default: 1
            The number of indentations.
        :param skipping : boolean, default: False
            Whether to skip the initial indentation.

        Returns
        -------
        return : string
            The indented text.

def indent(self, text, n_indents=1, skipping=False):
        """
        Indent text with single spaces.

        Parameters
        ----------
        :param text : string
            The text which get a specific indentation.
        :param n_indents : int, default: 1
            The number of indentations.
        :param skipping : boolean, default: False
            Whether to skip the initial indentation.

        Returns
        -------
        return : string
            The indented text.
        """
        lines = text.splitlines()
        space = self.TEMPLATES.get(self.target_language).get('indent', ' ')

        # Single line:
        if len(lines) == 1:
            if skipping:
                return text.strip()
            return n_indents * space + text.strip()

        # Multiple lines:
        indented_lines = []
        for idx, line in enumerate(lines):
            if skipping and idx is 0:
                indented_lines.append(line)
            else:
                line = n_indents * space + line
                indented_lines.append(line)
        indented_text = '\n'.join(indented_lines)
        return indented_text