[gnome-calculator] Mark functions and variables header translatable (#75)

[Robert Roth <robertroth src gnome org>]

commit 48f2d1a1ac79ec9d6f05f66a332b764f8c9b94fe
Author: Robert Roth <robert roth off gmail com>
Date:   Thu Sep 6 01:15:03 2018 +0300

    Mark functions and variables header translatable (#75)

 src/math-display.vala | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/math-display.vala b/src/math-display.vala
index 4b1a17c8..56403cea 100644
--- a/src/math-display.vala
+++ b/src/math-display.vala
@@ -496,7 +496,7 @@ public class FunctionCompletionProvider : CompletionProvider
 {
     public override string get_name ()
     {
-        return "Defined Functions";
+        return _("Defined Functions");
     }
 
     public static MathFunction[] get_matches_for_completion_at_cursor (Gtk.TextBuffer text_buffer)
@@ -553,7 +553,7 @@ public class VariableCompletionProvider : CompletionProvider
 
     public override string get_name ()
     {
-        return "Defined Variables";
+        return _("Defined Variables");
     }
 
     public static string[] get_matches_for_completion_at_cursor (Gtk.TextBuffer text_buffer, MathVariables 
variables )