Freeze prompt string to avoid realloc

Author: nattsw

app/services/discourse_ai/translator.rb

@@ -2,6 +2,14 @@
 
 module DiscourseAi
   class Translator
+    PROMPT_TEMPLATE = <<~TEXT.freeze
+      You are a highly skilled translator with expertise in many languages.
+      Your task is to identify the language of the text I provide and accurately translate it into this language locale "%{target_language}" while preserving the meaning, tone, and nuance of the original text.
+      The text may also contain html tags, which should be preserved in the translation.
+      Please maintain proper grammar, spelling, and punctuation in the translated version.
+      Wrap the translated text in a <translation> tag.
+    TEXT
+
     def initialize(text, target_language)
       @text = text
       @target_language = target_language
@@ -27,13 +35,7 @@ def translate
     private
 
     def build_prompt(target_language)
-      <<~TEXT
-          You are a highly skilled translator with expertise in many languages.
-          Your task is to identify the language of the text I provide and accurately translate it into this language locale "#{target_language}" while preserving the meaning, tone, and nuance of the original text.
-          The text may also contain html tags, which should be preserved in the translation.
-          Please maintain proper grammar, spelling, and punctuation in the translated version.
-          Wrap the translated text in a <translation> tag.
-        TEXT
+      PROMPT_TEMPLATE % { target_language: target_language }
     end
   end
 end