diff --git a/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/BookControllerTest.kt b/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/BookControllerTest.kt
index 03131ee29..f33a64de6 100644
--- a/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/BookControllerTest.kt
+++ b/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/BookControllerTest.kt
@@ -930,6 +930,7 @@ class BookControllerTest(
 
       val bookId = bookRepository.findAll().first().id
 
+      // language=JSON
       val jsonString = """
         {
           "title":"newTitle",
@@ -1015,6 +1016,7 @@ class BookControllerTest(
         bookMetadataRepository.update(updated)
       }
 
+      // language=JSON
       val jsonString = """
         {
           "summary":"",
@@ -1067,6 +1069,7 @@ class BookControllerTest(
         assertThat(releaseDate).isEqualTo(testDate)
       }
 
+      // language=JSON
       val jsonString = """
         {
           "authors":null,
@@ -1123,6 +1126,7 @@ class BookControllerTest(
         bookMetadataRepository.update(updated)
       }
 
+      // language=JSON
       val jsonString = """
         {
         }
@@ -1189,6 +1193,7 @@ class BookControllerTest(
         )
       }
 
+      // language=JSON
       val jsonString = """
         {
           "page": 5
@@ -1230,6 +1235,7 @@ class BookControllerTest(
         )
       }
 
+      // language=JSON
       val jsonString = """
         {
           "completed": true
@@ -1271,6 +1277,7 @@ class BookControllerTest(
         )
       }
 
+      // language=JSON
       val jsonString = """
         {
           "page": 5,
@@ -1318,6 +1325,7 @@ class BookControllerTest(
       )
     }
 
+    // language=JSON
     val jsonString = """
         {
           "completed": true
diff --git a/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/LibraryControllerTest.kt b/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/LibraryControllerTest.kt
index ceb331a61..c16908245 100644
--- a/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/LibraryControllerTest.kt
+++ b/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/LibraryControllerTest.kt
@@ -55,6 +55,7 @@ class LibraryControllerTest(
     @Test
     @WithAnonymousUser
     fun `given anonymous user when addOne then return unauthorized`() {
+      // language=JSON
       val jsonString = """{"name":"test", "root": "C:\\Temp"}"""
 
       mockMvc.post(route) {
@@ -76,6 +77,7 @@ class LibraryControllerTest(
     @Test
     @WithMockUser(roles = [ROLE_USER])
     fun `given user with USER role when addOne then return forbidden`() {
+      // language=JSON
       val jsonString = """{"name":"test", "root": "C:\\Temp"}"""
 
       mockMvc.post(route) {
diff --git a/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/ReadListControllerTest.kt b/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/ReadListControllerTest.kt
index 558a46a07..439e855f0 100644
--- a/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/ReadListControllerTest.kt
+++ b/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/ReadListControllerTest.kt
@@ -832,6 +832,7 @@ class ReadListControllerTest(
     @Test
     @WithMockCustomUser
     fun `given non-admin user when creating read list then return forbidden`() {
+      // language=JSON
       val jsonString = """
         {"name":"readlist","bookIds":["3"]}
       """.trimIndent()
@@ -847,6 +848,7 @@ class ReadListControllerTest(
     @Test
     @WithMockCustomUser(roles = [ROLE_ADMIN])
     fun `given admin user when creating read list then return ok`() {
+      // language=JSON
       val jsonString = """
         {"name":"readlist","summary":"summary","bookIds":["${booksLibrary1.first().id}"]}
       """.trimIndent()
@@ -867,6 +869,7 @@ class ReadListControllerTest(
     fun `given existing read lists when creating read list with existing name then return bad request`() {
       makeReadLists()
 
+      // language=JSON
       val jsonString = """
         {"name":"Lib1","bookIds":["${booksLibrary1.first().id}"]}
       """.trimIndent()
@@ -882,6 +885,7 @@ class ReadListControllerTest(
     @Test
     @WithMockCustomUser(roles = [ROLE_ADMIN])
     fun `given read list with duplicate bookIds when creating read list then return bad request`() {
+      // language=JSON
       val jsonString = """
         {"name":"Lib1","bookIds":["${booksLibrary1.first().id}","${booksLibrary1.first().id}"]}
       """.trimIndent()
@@ -900,6 +904,7 @@ class ReadListControllerTest(
     @Test
     @WithMockCustomUser
     fun `given non-admin user when updating read list then return forbidden`() {
+      // language=JSON
       val jsonString = """
         {"name":"readlist","bookIds":["3"]}
       """.trimIndent()
@@ -917,6 +922,7 @@ class ReadListControllerTest(
     fun `given admin user when updating read list then return no content`() {
       makeReadLists()
 
+      // language=JSON
       val jsonString = """
         {"name":"updated","summary":"updatedSummary","bookIds":["${booksLibrary1.first().id}"]}
       """.trimIndent()
@@ -943,6 +949,7 @@ class ReadListControllerTest(
     fun `given existing read lists when updating read list with existing name then return bad request`() {
       makeReadLists()
 
+      // language=JSON
       val jsonString = """{"name":"Lib2"}"""
 
       mockMvc.patch("/api/v1/readlists/${rlLib1.id}") {
@@ -958,6 +965,7 @@ class ReadListControllerTest(
     fun `given existing read list when updating read list with duplicate bookIds then return bad request`() {
       makeReadLists()
 
+      // language=JSON
       val jsonString = """{"bookIds":["${booksLibrary1.first().id}","${booksLibrary1.first().id}"]}"""
 
       mockMvc.patch("/api/v1/readlists/${rlLib1.id}") {
diff --git a/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/SeriesCollectionControllerTest.kt b/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/SeriesCollectionControllerTest.kt
index 876764c1d..7882675d7 100644
--- a/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/SeriesCollectionControllerTest.kt
+++ b/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/SeriesCollectionControllerTest.kt
@@ -721,6 +721,7 @@ class SeriesCollectionControllerTest(
     @Test
     @WithMockCustomUser
     fun `given non-admin user when creating collection then return forbidden`() {
+      // language=JSON
       val jsonString = """
         {"name":"collection","ordered":false,"seriesIds":["3"]}
       """.trimIndent()
@@ -736,6 +737,7 @@ class SeriesCollectionControllerTest(
     @Test
     @WithMockCustomUser(roles = [ROLE_ADMIN])
     fun `given admin user when creating collection then return ok`() {
+      // language=JSON
       val jsonString = """
         {"name":"collection","ordered":false,"seriesIds":["${seriesLibrary1.first().id}"]}
       """.trimIndent()
@@ -756,6 +758,7 @@ class SeriesCollectionControllerTest(
     fun `given existing collections when creating collection with existing name then return bad request`() {
       makeCollections()
 
+      // language=JSON
       val jsonString = """
         {"name":"Lib1","ordered":false,"seriesIds":["${seriesLibrary1.first().id}"]}
       """.trimIndent()
@@ -771,6 +774,7 @@ class SeriesCollectionControllerTest(
     @Test
     @WithMockCustomUser(roles = [ROLE_ADMIN])
     fun `given collection with duplicate seriesIds when creating collection then return bad request`() {
+      // language=JSON
       val jsonString = """
         {"name":"Lib1","ordered":false,"seriesIds":["${seriesLibrary1.first().id}","${seriesLibrary1.first().id}"]}
       """.trimIndent()
@@ -789,6 +793,7 @@ class SeriesCollectionControllerTest(
     @Test
     @WithMockCustomUser
     fun `given non-admin user when updating collection then return forbidden`() {
+      // language=JSON
       val jsonString = """
         {"name":"collection","ordered":false,"seriesIds":["3"]}
       """.trimIndent()
@@ -806,6 +811,7 @@ class SeriesCollectionControllerTest(
     fun `given admin user when updating collection then return no content`() {
       makeCollections()
 
+      // language=JSON
       val jsonString = """
         {"name":"updated","ordered":true,"seriesIds":["${seriesLibrary1.first().id}"]}
       """.trimIndent()
@@ -832,6 +838,7 @@ class SeriesCollectionControllerTest(
     fun `given existing collections when updating collection with existing name then return bad request`() {
       makeCollections()
 
+      // language=JSON
       val jsonString = """{"name":"Lib2"}"""
 
       mockMvc.patch("/api/v1/collections/${colLib1.id}") {
@@ -847,6 +854,7 @@ class SeriesCollectionControllerTest(
     fun `given existing collection when updating collection with duplicate seriesIds then return bad request`() {
       makeCollections()
 
+      // language=JSON
       val jsonString = """{"seriesIds":["${seriesLibrary1.first().id}","${seriesLibrary1.first().id}"]}"""
 
       mockMvc.patch("/api/v1/collections/${colLib1.id}") {
diff --git a/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/SeriesControllerTest.kt b/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/SeriesControllerTest.kt
index b85cc0208..ce92a8ee2 100644
--- a/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/SeriesControllerTest.kt
+++ b/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/SeriesControllerTest.kt
@@ -742,6 +742,7 @@ class SeriesControllerTest(
         }
       }
 
+      // language=JSON
       val jsonString = """
         {
           "title":"newTitle",
@@ -833,6 +834,7 @@ class SeriesControllerTest(
         assertThat(genres).hasSize(1)
       }
 
+      // language=JSON
       val jsonString = """
         {
           "readingDirection":null,
diff --git a/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/UserControllerDemoTest.kt b/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/UserControllerDemoTest.kt
index 4bb575937..02abb76aa 100644
--- a/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/UserControllerDemoTest.kt
+++ b/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/UserControllerDemoTest.kt
@@ -23,6 +23,7 @@ class UserControllerDemoTest(
   @Test
   @WithMockCustomUser
   fun `given demo profile is active when a user tries to update its password via api then returns forbidden`() {
+    // language=JSON
     val jsonString = """{"password":"new"}"""
 
     mockMvc.patch("/api/v2/users/me/password") {
diff --git a/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/UserControllerTest.kt b/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/UserControllerTest.kt
index ddcd5a0ca..bdd0a923c 100644
--- a/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/UserControllerTest.kt
+++ b/komga/src/test/kotlin/org/gotson/komga/interfaces/api/rest/UserControllerTest.kt
@@ -77,6 +77,7 @@ class UserControllerTest(
   @ValueSource(strings = ["user", "user@domain"])
   @WithMockCustomUser(roles = [ROLE_ADMIN])
   fun `when creating a user with invalid email then returns bad request`(email: String) {
+    // language=JSON
     val jsonString = """{"email":"$email","password":"password"}"""
 
     mockMvc.post("/api/v2/users") {
@@ -95,6 +96,7 @@ class UserControllerTest(
       val user = KomgaUser("user@example.org", "", false, id = "user", roleFileDownload = false, rolePageStreaming = false)
       userLifecycle.createUser(user)
 
+      // language=JSON
       val jsonString = """
         {
           "roles": ["$ROLE_FILE_DOWNLOAD","$ROLE_PAGE_STREAMING"]
@@ -124,6 +126,7 @@ class UserControllerTest(
       val user = KomgaUser("user@example.org", "", true, id = "user", roleFileDownload = true, rolePageStreaming = true)
       userLifecycle.createUser(user)
 
+      // language=JSON
       val jsonString = """
         {
           "roles": []
@@ -153,6 +156,7 @@ class UserControllerTest(
       val user = KomgaUser("user@example.org", "", false, id = "user", sharedAllLibraries = false, sharedLibrariesIds = setOf("1"))
       userLifecycle.createUser(user)
 
+      // language=JSON
       val jsonString = """
         {
           "sharedLibraries": {
@@ -184,6 +188,7 @@ class UserControllerTest(
       val user = KomgaUser("user@example.org", "", false, id = "user", sharedAllLibraries = true)
       userLifecycle.createUser(user)
 
+      // language=JSON
       val jsonString = """
         {
           "sharedLibraries": {
@@ -215,6 +220,7 @@ class UserControllerTest(
       val user = KomgaUser("user@example.org", "", false, id = "user", sharedAllLibraries = false, sharedLibrariesIds = setOf("2"))
       userLifecycle.createUser(user)
 
+      // language=JSON
       val jsonString = """
         {
           "sharedLibraries": {
@@ -246,6 +252,7 @@ class UserControllerTest(
       val user = KomgaUser("user@example.org", "", false, id = "user")
       userLifecycle.createUser(user)
 
+      // language=JSON
       val jsonString = """
         {
           "labelsAllow": ["cute", "kids"],
@@ -284,6 +291,7 @@ class UserControllerTest(
       )
       userLifecycle.createUser(user)
 
+      // language=JSON
       val jsonString = """
         {
           "labelsAllow": [],
@@ -313,6 +321,7 @@ class UserControllerTest(
       val user = KomgaUser("user@example.org", "", false, id = "user")
       userLifecycle.createUser(user)
 
+      // language=JSON
       val jsonString = """
         {
           "ageRestriction": {
@@ -345,6 +354,7 @@ class UserControllerTest(
       val user = KomgaUser("user@example.org", "", false, id = "user")
       userLifecycle.createUser(user)
 
+      // language=JSON
       val jsonString = """
         {
           "ageRestriction": {
@@ -376,6 +386,7 @@ class UserControllerTest(
       )
       userLifecycle.createUser(user)
 
+      // language=JSON
       val jsonString = """
         {
           "ageRestriction": null
@@ -411,6 +422,7 @@ class UserControllerTest(
       )
       userLifecycle.createUser(user)
 
+      // language=JSON
       val jsonString = """
         {
           "ageRestriction": {