Re-add syntax highlighting to daily emails and

...ATDC lessons

source/_daily_emails/2022-12-08.md

@@ -14,7 +14,7 @@ As long as a class implements an Interface, it can be decorated.
 
 For example, if I have this PHP interface:
 
-```php
+```language-php
 interface DoesSomething
 {
     public function doSomething(): void;
@@ -23,7 +23,7 @@ interface DoesSomething
 
 I could have this class that does something:
 
-```php
+```language-php
 final class FirstClass implements DoesSomething
 {
     public function doSomething(): void
@@ -37,7 +37,7 @@ If I need to do something else, like caching or logging the result, I can decora
 
 To do this, I need another class that implements the same interface and inject the original version.
 
-```php
+```language-php
 final class SecondClass implements DoesSomething
 {
     public function __constuct(