* src/filebuffer.cc (FileBuffer::create_with_error_message): Use
UTF-8 encoded typographically correct apostrophe in the title
string.
* src/filetree.cc (FileTree::find_recursively): Replace call to
Util::filename_to_utf8_fallback() by Glib::filename_display_name().
(FileTree::find_fill_dirstack): Likewise.
(FileTree::save_file_at_iter): Use UTF-8 encoded typographically
correct quote characters in the error message string.
(FileTree::load_file_with_fallback): Likewise.

* src/pcreshell.cc (throw_regex_error): New function to throw a
Pcre::Error exception with a properly formatted error message.
(Pcre::Pattern::Pattern): Use throw_regex_error().

* src/prefdialog.cc (PrefDialog::on_entry_fallback_activate):
Use proper Unicode quotes in error message string.

* src/mainwindow.cc (MainWindow::initialize): Run the search
automatically only if also a filename pattern has been specified
on the command line.
(MainWindow::confirm_quit_request): Use proper Unicode apostrophe
in the error message.
(MainWindow::on_find_files): Likewise.  Also remove the code to
format an error message for regex exceptions, as Pcre::Error now
already carries a user-friendly message.
(MainWindow::set_title_filename): Replace calls to
Util::filename_to_utf8_fallback() by Glib::filename_display_name().

* src/stringutils.{cc,h} (Util::shell_pattern_to_regex): Minor
optimization twiddling.
(Util::substitute_references): Likewise.
(Util::filename_to_utf8_fallback): Remove function, as we can
now simply use Glib::filename_display_name() instead.
(Util::convert_to_ascii): Remove; no longer used anywhere.
(Util::shorten_pathname): Use G_IS_DIR_SEPARATOR() instead of
comparing against G_DIR_SEPARATOR directly.  Necessary because
on win32 both '/' and '\' are accepted as directory separators.

* ui/regexxer.schemas.in: Reformat and use proper Unicode quotes
and apostrophes.
* ui/prefdialog.glade: Likewise.  Also remove some property
specifications which assigned default values anyway.
* ui/mainwindow.glade: As above, strip pointless property settings.

* en.po: Remove English "translation" as proper Unicode quotes and
apostrophes are now used directly in the untranslated messages.
* LINGUAS: Remove "en" from list.
* POTFILES.in: Prepend [encoding: UTF-8] to list of files.

svn path=/trunk/; revision=623