Move Comms Relay text boxes to new system

These seemed annoying to do without copy-pasting, because I didn't want
to make a separate function for every single dialogue, and I didn't know
how to pass through the English text, until I realized that I can just
use the existing original.lines vector in the text box to store the
English text. After that, getting it translated on-the-fly isn't too
bad.

desktop_version/src/Graphics.h

@@ -123,7 +123,7 @@ public:
 
     void textboxtranslate(TextboxTranslate translate, TextboxFunction function);
 
-    void textboxcommsrelay(void);
+    void textboxcommsrelay(const char* text);
 
     void textboxapplyposition(void);