fix: replace yaml frontmatter tags with tag (#2353)

localization/ko/adapter/README.md

@@ -2,7 +2,7 @@
 title: Adapter
 category: Structural
 language: ko
-tags:
+tag:
 - Gang of Four
 ---
 

localization/ko/builder/README.md

@@ -2,7 +2,7 @@
 title: Builder
 category: Creational
 language: ko
-tags:
+tag:
 - Gang of Four
 ---
 

localization/ko/factory/README.md

@@ -2,7 +2,7 @@
 title: Factory
 category: Creational
 language: ko
-tags:
+tag:
 - Gang of Four
 ---
 

localization/ko/iterator/README.md

@@ -2,7 +2,7 @@
 title: Iterator
 categories: Behavioral
 language: ko
-tags:
+tag:
 - Gang of Four
 ---
 

localization/ko/observer/README.md

@@ -2,7 +2,7 @@
 title: Observer
 category: Behavioral
 language: ko
-tags:
+tag:
 - Gang Of Four
 - Reactive
 ---

localization/ko/prototype/README.md

@@ -2,7 +2,7 @@
 title: Prototype
 category: Creational
 language: ko
-tags:
+tag:
 - Gang Of Four
 - Instantiation
 ---

localization/ko/proxy/README.md

@@ -2,7 +2,7 @@
 title: Proxy
 category: Structural
 language: ko
-tags:
+tag:
 - Gang Of Four
 - Decoupling
 ---

localization/ko/singleton/README.md

@@ -2,7 +2,7 @@
 title: Singleton
 category: Creational
 language: ko
-tags:
+tag:
 - Gang of Four
 ---
 

localization/ko/strategy/README.md

@@ -2,7 +2,7 @@
 title: Strategy
 category: Behavioral
 language: ko
-tags:
+tag:
  - Gang of Four
 ---
 

localization/ko/template-method/README.md

@@ -5,7 +5,7 @@ folder: template-method
 permalink: /patterns/template-method/ko
 categories: Behavioral
 language: ko
-tags:
+tag:
 - Gang of Four
 ---