proofreading help.html

german native professional translator and proofreader here.
please check there were some inconsistencies and spelling mistakes etc.

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Update skyhook.po

a couple of suggestions for a better translation
Updated address and transaction queries from http to https
Added ZAR Pricing Provider
Merge pull request #24 from layer1gfx/master

Update skyhook.po
Merge pull request #23 from layer1gfx/patch-1

proofreading help.html