Merge branch '4.3' into 4.4

* 4.3:
  [Debug] fix ClassNotFoundFatalErrorHandler
  [Routing] Fix using a custom matcher & generator dumper class
  [Dotenv] Fixed infinite loop with missing quote followed by quoted value
  [HttpClient] Added missing sprintf
  [TwigBridge] button_widget now has its title attr translated even if its label = null or false
  [PhpUnitBridge] When using phpenv + phpenv-composer plugin, composer executable is wrapped into a bash script
  [Messenger] Added check if json_encode succeeded
  [Security] Prevent canceled remember-me cookie from being accepted
  [FrameworkBundle][TranslationUpdateCommand] Do not output positive feedback on stderr
  [Security\Guard] Fix missing typehints

Author: nicolas-grekas

Resources/views/Form/form_div_layout.html.twig

@@ -228,13 +228,11 @@
                 '%name%': name,
                 '%id%': id,
             }) %}
-        {%- elseif label is same as(false) -%}
-            {% set translation_domain = false %}
-        {%- else -%}
+        {%- elseif label is not same as(false) -%}
             {% set label = name|humanize %}
         {%- endif -%}
     {%- endif -%}
-    <button type="{{ type|default('button') }}" {{ block('button_attributes') }}>{{ translation_domain is same as(false) ? label : label|trans(label_translation_parameters, translation_domain) }}</button>
+    <button type="{{ type|default('button') }}" {{ block('button_attributes') }}>{{ translation_domain is same as(false) or label is same as(false) ? label : label|trans(label_translation_parameters, translation_domain) }}</button>
 {%- endblock button_widget -%}
 
 {%- block submit_widget -%}