Add sample dictionary downloaders/builders

dicts/gnu-fdl-en-cz.sh

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+#!/bin/sh -e
+# GNU/FDL English-Czech dictionary, see https://www.svobodneslovniky.cz/
+curl -Lo- https://www.svobodneslovniky.cz/data/en-cs.txt.gz | \
+zcat | grep -v ^# | sed 's/\\//g' | perl -CSD -F\\t -le '
+	sub e { shift =~ s/\\/\\\\/gr =~ s/\n/\\n/gr =~ s/\t/\\t/gr }
+	sub w {
+		open(my $f, "|-", "tabfile gnu-fdl-$_[0]") or die $!;
+		print $f e($k) . "\t" . e(join("\n", @$v))
+			while ($k, $v) = each %{$_[1]};
+		close($f);
+	}
+	my ($en, $cz, $notes, $special, $translator) = @F;
+	if ($cz) {
+		$notes =~ s/\w+:\s?//g;          # remove word classes
+		$notes =~ s/(\w+\.)(?!])/($1)/;  # quote "pl."
+		push(@{$encz{$en}}, $notes ? "$cz " . $notes : $cz);
+		push(@{$czen{$cz}}, $notes ? "$en " . $notes : $en);
+	} END {
+		w("en-cz", \%encz);
+		w("cz-en", \%czen);
+	}'

dicts/slovnik-cizich-slov.sh

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+#!/bin/sh -e
+# Slovník cizích slov, see https://slovnik-cizich-slov.abz.cz/web.php/o-slovniku
+# TODO: Skipping the optional pronunciation field, tabfile can't handle it yet,
+# but could be made to accept a lowercase sametypesequence
+curl -Lo- https://slovnik-cizich-slov.abz.cz/export.php | \
+iconv -f latin2 -t UTF-8 | perl -CSD -F\\\| -le '
+	print "$_\t" . $F[2] =~ s/\\/\\\\/gr =~ s/; /\\n/gr for split(", ", $F[0])
+' | sort -u | tabfile slovnik-cizich-slov