Update help description for install command.

Replace the word `add` with the word `install` to match the verb of the
tool.

src/dotnet/commands/dotnet-help/LocalizableStrings.resx

@@ -268,6 +268,6 @@
     <value>Path to additional deps.json file.</value>
   </data>
   <data name="InstallDefinition" xml:space="preserve">
-    <value>Add item to development environment.</value>
+    <value>Installs an item into the development environment.</value>
   </data>
 </root>

src/dotnet/commands/dotnet-help/xlf/LocalizableStrings.cs.xlf

@@ -253,8 +253,8 @@
         <note />
       </trans-unit>
       <trans-unit id="InstallDefinition">
-        <source>Add item to development environment.</source>
-        <target state="new">Add item to development environment.</target>
+        <source>Installs an item into the development environment.</source>
+        <target state="new">Installs an item into the development environment.</target>
         <note />
       </trans-unit>
     </body>

src/dotnet/commands/dotnet-help/xlf/LocalizableStrings.de.xlf

@@ -253,8 +253,8 @@
         <note />
       </trans-unit>
       <trans-unit id="InstallDefinition">
-        <source>Add item to development environment.</source>
-        <target state="new">Add item to development environment.</target>
+        <source>Installs an item into the development environment.</source>
+        <target state="new">Installs an item into the development environment.</target>
         <note />
       </trans-unit>
     </body>

src/dotnet/commands/dotnet-help/xlf/LocalizableStrings.es.xlf

@@ -253,8 +253,8 @@
         <note />
       </trans-unit>
       <trans-unit id="InstallDefinition">
-        <source>Add item to development environment.</source>
-        <target state="new">Add item to development environment.</target>
+        <source>Installs an item into the development environment.</source>
+        <target state="new">Installs an item into the development environment.</target>
         <note />
       </trans-unit>
     </body>

src/dotnet/commands/dotnet-help/xlf/LocalizableStrings.fr.xlf

@@ -253,8 +253,8 @@
         <note />
       </trans-unit>
       <trans-unit id="InstallDefinition">
-        <source>Add item to development environment.</source>
-        <target state="new">Add item to development environment.</target>
+        <source>Installs an item into the development environment.</source>
+        <target state="new">Installs an item into the development environment.</target>
         <note />
       </trans-unit>
     </body>

src/dotnet/commands/dotnet-help/xlf/LocalizableStrings.it.xlf

@@ -253,8 +253,8 @@
         <note />
       </trans-unit>
       <trans-unit id="InstallDefinition">
-        <source>Add item to development environment.</source>
-        <target state="new">Add item to development environment.</target>
+        <source>Installs an item into the development environment.</source>
+        <target state="new">Installs an item into the development environment.</target>
         <note />
       </trans-unit>
     </body>

src/dotnet/commands/dotnet-help/xlf/LocalizableStrings.ja.xlf

@@ -253,8 +253,8 @@
         <note />
       </trans-unit>
       <trans-unit id="InstallDefinition">
-        <source>Add item to development environment.</source>
-        <target state="new">Add item to development environment.</target>
+        <source>Installs an item into the development environment.</source>
+        <target state="new">Installs an item into the development environment.</target>
         <note />
       </trans-unit>
     </body>

src/dotnet/commands/dotnet-help/xlf/LocalizableStrings.ko.xlf

@@ -253,8 +253,8 @@
         <note />
       </trans-unit>
       <trans-unit id="InstallDefinition">
-        <source>Add item to development environment.</source>
-        <target state="new">Add item to development environment.</target>
+        <source>Installs an item into the development environment.</source>
+        <target state="new">Installs an item into the development environment.</target>
         <note />
       </trans-unit>
     </body>

src/dotnet/commands/dotnet-help/xlf/LocalizableStrings.pl.xlf

@@ -253,8 +253,8 @@
         <note />
       </trans-unit>
       <trans-unit id="InstallDefinition">
-        <source>Add item to development environment.</source>
-        <target state="new">Add item to development environment.</target>
+        <source>Installs an item into the development environment.</source>
+        <target state="new">Installs an item into the development environment.</target>
         <note />
       </trans-unit>
     </body>

src/dotnet/commands/dotnet-help/xlf/LocalizableStrings.pt-BR.xlf

@@ -253,8 +253,8 @@
         <note />
       </trans-unit>
       <trans-unit id="InstallDefinition">
-        <source>Add item to development environment.</source>
-        <target state="new">Add item to development environment.</target>
+        <source>Installs an item into the development environment.</source>
+        <target state="new">Installs an item into the development environment.</target>
         <note />
       </trans-unit>
     </body>

src/dotnet/commands/dotnet-help/xlf/LocalizableStrings.ru.xlf

@@ -253,8 +253,8 @@
         <note />
       </trans-unit>
       <trans-unit id="InstallDefinition">
-        <source>Add item to development environment.</source>
-        <target state="new">Add item to development environment.</target>
+        <source>Installs an item into the development environment.</source>
+        <target state="new">Installs an item into the development environment.</target>
         <note />
       </trans-unit>
     </body>

src/dotnet/commands/dotnet-help/xlf/LocalizableStrings.tr.xlf

@@ -253,8 +253,8 @@
         <note />
       </trans-unit>
       <trans-unit id="InstallDefinition">
-        <source>Add item to development environment.</source>
-        <target state="new">Add item to development environment.</target>
+        <source>Installs an item into the development environment.</source>
+        <target state="new">Installs an item into the development environment.</target>
         <note />
       </trans-unit>
     </body>

src/dotnet/commands/dotnet-help/xlf/LocalizableStrings.zh-Hans.xlf

@@ -253,8 +253,8 @@
         <note />
       </trans-unit>
       <trans-unit id="InstallDefinition">
-        <source>Add item to development environment.</source>
-        <target state="new">Add item to development environment.</target>
+        <source>Installs an item into the development environment.</source>
+        <target state="new">Installs an item into the development environment.</target>
         <note />
       </trans-unit>
     </body>

src/dotnet/commands/dotnet-help/xlf/LocalizableStrings.zh-Hant.xlf

@@ -253,8 +253,8 @@
         <note />
       </trans-unit>
       <trans-unit id="InstallDefinition">
-        <source>Add item to development environment.</source>
-        <target state="new">Add item to development environment.</target>
+        <source>Installs an item into the development environment.</source>
+        <target state="new">Installs an item into the development environment.</target>
         <note />
       </trans-unit>
     </body>

test/dotnet-help.Tests/GivenThatIWantToShowHelpForDotnetCommand.cs

@@ -39,7 +39,7 @@ SDK commands:
   msbuild          Runs Microsoft Build Engine (MSBuild).
   vstest           Runs Microsoft Test Execution Command Line Tool.
   store            Stores the specified assemblies in the runtime store.
-  install          Add item to development environment.
+  install          Installs an item into the development environment.
   help             Show help.
 
 Common options: