Standardize directory/folder to folder

[Frenzie]

Two more entries

koreader/frontend/ui/widget/filechooser.lua

Lines 227 to 236 in 1bd4636

	if dir.name == ".." then
	text = up_folder_arrow
	elseif dir.name == "." then -- possible with show_current_dir_for_hold
	text = _("Long-press to select current directory")
	elseif dir.name == "./." then -- added as content of an unreadable directory
	text = _("Current directory not readable. Some content may not be shown.")
	else
	text = dir.name.."/"
	bidi_wrap_func = BD.directory
	end

Originally posted by @hius07 in #7157 (comment)

[hius07]

One more

koreader/frontend/apps/filemanager/filemanagerbookinfo.lua

Line 67 in b5de2b2

table.insert(kv_pairs, { _("Directory:"), BD.dirpath(filemanagerutil.abbreviate(directory)), separator = true })

[hius07]

One entry here

koreader/frontend/ui/widget/pathchooser.lua

Line 113 in 0388507

title = T(_("Select this directory?\n\n%1"), BD.dirpath(path))

and 3 entries in

koreader/plugins/opds.koplugin/opdsbrowser.lua

Line 614 in 0388507

title = T(_("Download directory:\n%1\n\nDownload file type:"), BD.dirpath(path)),