i18n - unit tests

- Added more utf8.t unit tests.
- Removed text.cpp:extractParagraphs, which is not used.

src/tests/utf8.t

@@ -41,6 +41,7 @@ if (open my $fh, '>', 'utf8.rc')
 # Add a task with UTF8 in the description.
 qx{../task rc:utf8.rc add Çirçös};
 qx{../task rc:utf8.rc add Hello world ☺};
+qx{../task rc:utf8.rc add ¥£€$¢₡₢₣₤₥₦₧₨₩₪₫₭₮₯};
 qx{../task rc:utf8.rc add Pchnąć w tę łódź jeża lub ośm skrzyń fig};
 qx{../task rc:utf8.rc add ๏ เป็นมนุษย์สุดประเสริฐเลิศคุณค่า};
 qx{../task rc:utf8.rc add イロハニホヘト チリヌルヲ ワカヨタレソ ツネナラム};
@@ -58,7 +59,7 @@ qx{../task rc:utf8.rc add Ξεσκεπάζω τὴν ψυχοφθόρα βδελ
 
 my $output = qx{../task rc:utf8.rc ls};
 diag ($output);
-like ($output, qr/16/, 'all 16 tasks shown');
+like ($output, qr/17/, 'all 17 tasks shown');
 
 # Cleanup.
 unlink 'pending.data';