DCP-o-matic 2.18.46 released

[carl]

Download now from here.

• Updated nl_NL translation from Rob van Nieuwkerk.
• Updated de_DE translation from Roger Siegenthaler.
• Updated fa_IR translation from Soleyman Rahmani.
• Hopefully fix a range of long-standing bugs where encoding / playback would fail with media on removable or network drives.
• Fix position of punctuation in RTL subtitles in some cases.
• Force RTL layout when subtitles are marked RTL.
• Tolerate use of TTC (instead of TTF) as a font in a DCP.