Fix orthography

A lot of the output does not regard proper orthography, e.g. in src/sqa/services/list_used_licenses/list_used_licenses.py:

    def generate_markdown_chapter(self) -> str:
        """
        Generates a markdown version of the result as a chapter for a report.
        """
# ...
        md_result += "#### found licenses\n\n"
        md_result += "|license|libraries|\n"
# ...
        if len(self.errors) > 0:
            md_result += "#### errors\n\n"
# ...

and much more. We should go through all output values and fix this.