Add lower german quotation mark and fix tests

[taygun]

👋 I've added the german lower quotation mark as presented in this issue, updated the spec tests and added a new integration test for this case.

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Here's the reason for this change 🚀

• Fixes pelias/pelias#1569

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Here's what actually got changed 👏

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Here's how others can test the changes 👀

[missinglink]

this looks perfect, I'm not sure why the CI isn't running but once I can confirm it passes we can merge this.

[missinglink]

thanks!

for fun: https://jakubmarian.com/map-of-quotation-marks-in-european-languages/