[RTL UI] Bidi-wrap filenames, paths, urls, metadata

bidi.lua:
- Revert "Alias everything to Bidi.nowrap() when in LTR UI,
  as using LTR isolates seems uneeded when already LTR" (part
  of a628714f) which was a wrong assumption: we need proper
  wrappers for all things paths. Enhance some of these wrappers.
- Fix GetText RTL wrapping which was losing empty lines and
  trailing \n.

- Wrap all paths, directories, filenames in the code with
  these wrappers.
- Wrap all book metadata (title, authors...) with BD.auto(),
  as it helps fixing some edge cases (like open/close quotation
  marks which are not considered as bracket types by FriBiDi).
  (Needed some minor logic changes in CoverBrowser.)

- Tweak hyphenation menu text
- Update forgotten SortWidget for UI mirroring
- KoptConfig: update "justification" index for RTL re-ordering,
  following the recent addition of the page_gap_height option.

frontend/util.lua

@@ -954,14 +954,15 @@ end
 function util.unpackArchive(archive, extract_to)
     dbg.dassert(type(archive) == "string")
 
+    local BD = require("ui/bidi")
     local ok
     if archive:match("%.tar%.bz2$") or archive:match("%.tar%.gz$") or archive:match("%.tar%.lz$") or archive:match("%.tgz$") then
         ok = os.execute(("./tar xf %q -C %q"):format(archive, extract_to))
     else
-        return false, T(_("Couldn't extract archive:\n\n%1\n\nUnrecognized filename extension."), archive)
+        return false, T(_("Couldn't extract archive:\n\n%1\n\nUnrecognized filename extension."), BD.filepath(archive))
     end
     if not ok then
-        return false, T(_("Extracting archive failed:\n\n%1", archive))
+        return false, T(_("Extracting archive failed:\n\n%1", BD.filepath(archive)))
     end
     return true
 end