It is not possible to change the quotation introduction added when answering mail. Andre Klapper ak-47@gmx.net Changing the "On date, person wrote:" string when replying

You might need to install the dconf-editor package to perform these steps.

Install dconf-editor

Advanced users can change this string.

Open the dconf-editor application.

Navigate to org.gnome.evolution.mail.

Enter the preferred quotation string as the value for the key composer-message-attribution.

The default string in English is: "On ${AbbrevWeekdayName}, ${Year}-${Month}-${Day} at ${24Hour}:${Minute} ${TimeZone}, ${Sender} wrote:"

The following placeholders are available:

{Sender}

{SenderName}

{SenderEMail}

{AbbrevWeekdayName}

{WeekdayName}

{AbbrevMonthName}

{MonthName}

{Day} (format: 01-31)

{ Day} (format: 1-31)

{24Hour}

{12Hour}

{AmPmUpper}

{AmPmLower}

{DayOfYear} (format: 1-366)

{Month} (format: 01-12)

{Minute}

{Seconds}

{2DigitYear} (e.g. 15 for the year 2015)

{Year}

{TimeZone}