Fix typo in an error message

* scripts/Dpkg/Source/Package/V3/git.pm (do_extract): Fix error message.
* scripts/po/*.po: Update the po files accordingly.

scripts/Dpkg/Source/Package/V3/git.pm

@@ -306,7 +306,7 @@ sub do_extract {
     if (%config) {
 	warning(_g("modifying .git/config to comment out some settings"));
 	open(GIT_CONFIG, ">>", ".git/config") ||
-	    syserr(_g("unstable to append to %s"), ".git/config");
+	    syserr(_g("unable to append to %s"), ".git/config");
 	print GIT_CONFIG "\n# "._g("The following setting(s) were disabled by dpkg-source").":\n";
 	foreach my $field (sort keys %config) {
 	    foreach my $value (@{$config{$field}}) {

scripts/po/ca.po

@@ -2618,7 +2618,7 @@ msgstr ""
 
 #: scripts/Dpkg/Source/Package/V3/git.pm:309
 #, perl-format
-msgid "unstable to append to %s"
+msgid "unable to append to %s"
 msgstr ""
 
 #: scripts/Dpkg/Source/Package/V3/git.pm:310

scripts/po/de.po

@@ -3021,7 +3021,7 @@ msgstr "ver
 
 #: scripts/Dpkg/Source/Package/V3/git.pm:309
 #, perl-format
-msgid "unstable to append to %s"
+msgid "unable to append to %s"
 msgstr ""
 
 #: scripts/Dpkg/Source/Package/V3/git.pm:310

scripts/po/dpkg-dev.pot

@@ -2586,7 +2586,7 @@ msgstr ""
 
 #: scripts/Dpkg/Source/Package/V3/git.pm:309
 #, perl-format
-msgid "unstable to append to %s"
+msgid "unable to append to %s"
 msgstr ""
 
 #: scripts/Dpkg/Source/Package/V3/git.pm:310

scripts/po/fr.po

@@ -3021,7 +3021,7 @@ msgstr ""
 
 #: scripts/Dpkg/Source/Package/V3/git.pm:309
 #, fuzzy, perl-format
-msgid "unstable to append to %s"
+msgid "unable to append to %s"
 msgstr "impossible d'ouvrir le répertoire %s"
 
 #: scripts/Dpkg/Source/Package/V3/git.pm:310

scripts/po/pl.po

@@ -3025,7 +3025,7 @@ msgstr ""
 
 #: scripts/Dpkg/Source/Package/V3/git.pm:309
 #, perl-format
-msgid "unstable to append to %s"
+msgid "unable to append to %s"
 msgstr "nie można dopisać do %s"
 
 #: scripts/Dpkg/Source/Package/V3/git.pm:310

scripts/po/ru.po

@@ -2979,7 +2979,7 @@ msgstr ""
 
 #: scripts/Dpkg/Source/Package/V3/git.pm:309
 #, fuzzy, perl-format
-msgid "unstable to append to %s"
+msgid "unable to append to %s"
 msgstr "Невозможно открыть каталог %s"
 
 #: scripts/Dpkg/Source/Package/V3/git.pm:310

scripts/po/sv.po

@@ -2977,7 +2977,7 @@ msgstr "modifierar .git/config för att kommentera ut några inställningar"
 
 #: scripts/Dpkg/Source/Package/V3/git.pm:309
 #, perl-format
-msgid "unstable to append to %s"
+msgid "unable to append to %s"
 msgstr "kunde inte lägga till till %s"
 
 #: scripts/Dpkg/Source/Package/V3/git.pm:310