Notifier user when it was impossible to parse SG
Implement aU.find for arrays
Implement aU.unique for arrays
Fix and refactor aU.unique()
More strict unique'ing in morph

Mild hack to avoid unnecessary dialect multiplication in greek. When
lemma and postag are the same, we show the form only once.
Show what's wrong when sg labels are incompatible
Even better error message in sg
Refactor error message
Further refactor of sg error message
Fix arethusaUtil.unique()
Addendum to #412

Works on #415
Be more rigid determining terminating puncts
Minor translation change
Minor: Use correct translation key in landing page