unitframes: add option for custom portrait size

env/translations_enUS.lua

@@ -525,6 +525,9 @@ pfUI_translation["enUS"] = {
   ["Please enter a name of a character who should receive your whispers:"] = nil,
   ["Portrait Alpha"] = nil,
   ["Portrait Position"] = nil,
+  ["Enable Custom Portrait Size"] = nil,
+  ["Portrait Height"] = nil,
+  ["Portrait Width"] = nil,
   ["Powerbar"] = nil,
   ["Power Bar Anchor"] = nil,
   ["Power Bar Height"] = nil,