Small i18n issue

[Karl Eichwalder <keichwa gmx net>]

Please, adjust these messages:

#: src/workbook.c:1136
msgid "Sheet name"
msgstr "Ein Blattname"

#: src/workbook.c:1137
msgid "must have at least 1 letter"
msgstr "muss wenigstens einen Buchstaben haben"

#: src/workbook.c:1150
msgid "There is already a sheet named"
msgstr "Es gibt bereits ein Blatt mit dem Namen"

Please, make the variable part of the string:

    "Sheet name %s must have at least 1 letter"
    "There is already a sheet named %s"

Otherwise it's hard or impossible provide a good translation.  Thanks!

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