Follow up the PR #5167 (Add Turkish Language), etc

・Remove all the #ifndef
・Follow the PR #4603 (Strip never-translated strings from language
files)
・Follow the PR #4634 (Set language display charset in language.h)
・Follow the PR #4936 (Put max_jerk vars in array, clean up jerk code)
・Adjust spacing

Marlin/language.h

@@ -70,6 +70,7 @@
 // pt-br_utf8 Portuguese (Brazilian UTF8)
 // pt_utf8    Portuguese (UTF8)
 // ru         Russian
+// tr         Turkish
 
 #ifdef DEFAULT_SOURCE_CODE_URL
   #undef  SOURCE_CODE_URL

Marlin/language_cn.h

@@ -29,6 +29,7 @@
  */
 #ifndef LANGUAGE_CN_H
 #define LANGUAGE_CN_H
+
 #define DISPLAY_CHARSET_ISO10646_CN
 
 #define WELCOME_MSG                         "\xa4\xa5\xa6\xa7"

Marlin/language_es.h

@@ -209,4 +209,5 @@
 #define MSG_FILAMENT_CHANGE_RESUME_1        "Esperando imp."
 #define MSG_FILAMENT_CHANGE_RESUME_2        "para resumir"
 #define MSG_FILAMENT_CHANGE_RESUME_3        ""
+
 #endif // LANGUAGE_ES_H