Delete langs command (#1836)

* Delete langs command

* Delete "langs" from docker entrypoint script

* langs -> list

* langs -> list

docker-entrypoint.sh

@@ -12,7 +12,7 @@ codegen="${cli}/target/openapi-generator-cli.jar"
 # We code in a list of commands here as source processing is potentially buggy (requires undocumented conventional use of annotations).
 # A list of known commands helps us determine if we should compile CLI. There's an edge-case where a new command not added to this
 # list won't be considered a "real" command. We can get around that a bit by checking CLI completions beforehand if it exists.
-commands="list,generate,meta,langs,help,config-help,validate,version"
+commands="list,generate,meta,help,config-help,validate,version"
 
 # if CLI jar exists, check $1 against completions available in the CLI
 if [[ -f "${codegen}" && -n "$(java ${JAVA_OPTS} -jar "${codegen}" completion | grep "^$1\$" )" ]]; then

docs/migration-guide.adoc

@@ -20,7 +20,7 @@ Version `4.0.0` is a major release, which contains some breaking changes without
 The option is replaced with `-g` (`--generator-name`).
 
 * `-g` allows the same values as `-l`
-* See `langs` command for the list of generator name
+* See `list` command for the list of generator name
 
 === From 3.1.x to 3.2.0
 

modules/openapi-generator-cli/src/main/java/org/openapitools/codegen/OpenAPIGenerator.java

@@ -50,7 +50,6 @@ public static void main(String[] args) {
                                 ListGenerators.class,
                                 Generate.class,
                                 Meta.class,
-                                Langs.class,
                                 Help.class,
                                 ConfigHelp.class,
                                 Validate.class,

modules/openapi-generator-cli/src/main/java/org/openapitools/codegen/cmd/Generate.java

@@ -50,7 +50,7 @@ public class Generate implements Runnable {
     private Boolean verbose;
 
     @Option(name = {"-g", "--generator-name"}, title = "generator name",
-            description = "generator to use (see langs command for list)")
+            description = "generator to use (see list command for list)")
     private String generatorName;
 
     @Option(name = {"-o", "--output"}, title = "output directory",