The following is a typical German Keyboard (T1):
You can hover with the mouse over the keys.
https://de.wikipedia.org/wiki/Tastat...C3.96sterreich
At the left side of the backspace key you can see
(`) Gravis
(´) Akute
(’) The (typographically correct) Apostroph is not accessible with a key, you have to type ALT+0146 (see
https://de.wikipedia.org/wiki/Apostr...afisch_korrekt)
At the left side of the return key (together with #):
(') Apostroph (typographically incorrect/replacement character) (
https://de.wikipedia.org/wiki/Apostr...rafisch_falsch)
So a typically German (like me) takes this (') (typographically incorrect) Apostroph
or
(´) Akute (which is wrong)
The Gernan Duden (Dictionary of the German language) uses the (typographically incorrect) (') Apostroph in the article about Apostroph:
http://www.duden.de/sprachwissen/rec...geln/apostroph
So i checked this with the only spellchecker of Duden:
Duden | Rechtschreibprüfung Online Betaversion
http://www.duden.de/rechtschreibpruefung-online
(´) akute U+00B4:
Halt´s Maul! Macht´s gut! Da gab´s keinen! Ich hab´s! Wie geht´s!
(’) Apostroph (typographically correct) U+2019 [Alt+0146:]; ’
Halt’s Maul! Macht’s gut! Da gab’s keinen! Ich hab’s! Wie geht’s!
(') replacement character for apostroph U+0027; ' (since HTML 5)
Halt's Maul! Macht's gut! Da gab's keinen! Ich hab's! Wie geht's!
As you can see the text is correct using the acute symbol and using a real apostrophe gives a misspelled word:
So they do it wrong!
I checked this again with Sigil and the German Hunspell dictionary. It does the same mistake. Additional I used the HTML-Entities ' ’ but they are converted to the real characters during saving.
This is the new version of the testcase epub:
https://www.mobileread.com/forums/at...1&d=1485176688
What can i do to make the differences between the acute and the tweo versions of apostroph visible in the book views of Sigil?