Work around temp strings being uppercased

Handle Google Translate sometimes turning x0, x1 etc. into X0, X1 in the
translated string.

src/Drivers/Translation.php

@@ -87,21 +87,19 @@ public function getGoogleTranslate($language, $token)
 
         // Step 2: Replace placeholders with temporary unique strings
         $modifiedToken = $token;
-        $placeholderMap = [];
+        $tempStrings = [];
         foreach ($placeholders as $index => $placeholder) {
-            $tempString = 'x' . $index;
-            $placeholderMap[$tempString] = $placeholder;
-            $modifiedToken = str_replace($placeholder, $tempString, $modifiedToken);
+            $tempStrings[] = 'x' . $index;
         }
+        $modifiedToken = str_replace($placeholders, $tempStrings, $modifiedToken);
 
         // Step 3: Translate the modified text using Google Translate
         $tr = new GoogleTranslate($language, $this->sourceLanguage);
         $translatedText = $tr->translate($modifiedToken);
 
         // Step 4: Replace the temporary unique strings back with the original placeholders
-        foreach ($placeholderMap as $tempString => $placeholder) {
-            $translatedText = str_replace($tempString, $placeholder, $translatedText);
-        }
+        //Note: we're using case-insensitive replace because Google Translate sometimes uppercases the x
+        $translatedText = str_ireplace($tempStrings, $placeholders, $translatedText);
 
         // Step 5: Check if the number of placeholders has stayed the same
         preg_match_all($placeholderRegex, $translatedText, $translatedMatches);