Doc: replace "user name" with "username"

In the UI and docs, when in the context of
authentication.

Change-Id: I643b5c831ba1d63cf41e8ab31ec98735a2d07dc7
Reviewed-by: Daniel Teske <daniel.teske@digia.com>
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

doc/src/linux-mobile/linuxdev.qdoc

@@ -78,8 +78,8 @@
                     enter the host name or IP address of the device.
                     This value will be available in the variable \c %{CurrentDevice:HostAddress}.
 
-                \li In the \gui {The user name to log into the device} field,
-                    enter the user name to log into the device and run the
+                \li In the \gui {The username to log into the device} field,
+                    enter the username to log into the device and run the
                     application as.
                     This value will be available in the variable \c %{CurrentDevice:UserName}.
 

src/plugins/mercurial/authenticationdialog.ui

@@ -19,7 +19,7 @@
      <item row="0" column="0">
       <widget class="QLabel" name="usernameLabel">
        <property name="text">
-        <string>User name:</string>
+        <string>Username:</string>
        </property>
       </widget>
      </item>

src/plugins/projectexplorer/projectexplorer.cpp

@@ -1091,7 +1091,7 @@ bool ProjectExplorerPlugin::initialize(const QStringList &arguments, QString *er
         []() { return variableValue(Constants::VAR_CURRENTDEVICE_SSHPORT); });
 
     VariableManager::registerVariable(Constants::VAR_CURRENTDEVICE_USERNAME,
-        tr("The user name with which to log into the device in the currently active kit."),
+        tr("The username with which to log into the device in the currently active kit."),
         []() { return variableValue(Constants::VAR_CURRENTDEVICE_USERNAME); });
 
     VariableManager::registerVariable(Constants::VAR_CURRENTDEVICE_PRIVATEKEYFILE,

src/plugins/remotelinux/genericlinuxdeviceconfigurationwizardsetuppage.ui

@@ -58,7 +58,7 @@
    <item row="2" column="0">
     <widget class="QLabel" name="userNameLabel">
      <property name="text">
-      <string>The user name to log into the device:</string>
+      <string>The username to log into the device:</string>
      </property>
     </widget>
    </item>