initial translation step on github
converted german README from html to rst with pandoc
converted german README from html to md with pandoc
reStructuredText Version removed
reconverted the former html source to merkdown without wordwrap. Now fully revised with one line per sentence and corrected, but history and latest changes since 1.2.4 not fully updated.
fixed a typo.
Update README.md
Changes to the add-on's peripheral files to address #17, #19, and #20.

* Make md the primary format for the README in all languages.
* Add external files related to the addons.mozilla.org listings to the
   repository in Extra/AMO and Extra/locale
* Add utility scripts (e.g. packaing the XPI and formatting the README)
    to the repository
* Ajdust formatting of the German README.md to match the English version
* Fix minor typos/formatting in English README.md
Clarify attachments as Zotero attachments (issue #17) in en-US and es
locales.
Break out overlooked sentences in README.md
Minor formatting changes to README to improve consistency
Update German translations. Update other translation file formatting.
Remove placeholders from German readme.