feat: global configuration of results_title and prompt_title (#1817)

lua/telescope/config.lua

@@ -419,6 +419,27 @@ append(
   Default: false]]
 )
 
+append(
+  "results_title",
+  "Results",
+  [[
+  Defines the default title of the results window. A false value
+  can be used to hide the title altogether.
+
+  Default: "Results"]]
+)
+
+append(
+  "prompt_title",
+  "Prompt",
+  [[
+  Defines the default title of the prompt window. A false value
+  can be used to hide the title altogether. Most of the times builtins
+  define a prompt_title which will be prefered over this default.
+
+  Default: "Prompt"]]
+)
+
 append(
   "history",
   {