[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/apps/reader/modules/readergesture.lua

@@ -1490,7 +1490,7 @@ function ReaderGesture:gestureAction(action, ges)
             local current_network = NetworkMgr:getCurrentNetwork()
             -- this method is only available for some implementations
             if current_network and current_network.ssid then
-                info_text = T(_("Already connected to network %1."), current_network.ssid)
+                info_text = T(_("Already connected to network %1."), BD.wrap(current_network.ssid))
             else
                 info_text = _("Already connected.")
             end