Add new lang constants for the installer

Someone (@garvinhicking) please run addlang.sh for me to add these
(doesn't work on OSX command line). Thanks.

lang/addlang.txt

@@ -1,6 +1,3 @@
-@define('INSTALLER_KEY', 'Key');
-@define('INSTALLER_VALUE', 'Value');
-@define('CURRENT_TAB', 'Current tab: ');
-@define('PINGBACKS', 'Pingbacks');
-@define('NO_PINGBACKS', 'No Pingbacks');
-@define('GROUP_NAME_DESC', "Use as uppercased eg. 'EXAMPLE_GROUP' name, but not as a constant 'USERLEVEL_XYZ' group name.");
+@define('INSTALLER_CLI_TOOLS', 'Server-side command line tools');
+@define('INSTALLER_CLI_TOOLNAME', 'CLI tool');
+@define('INSTALLER_CLI_TOOLSTATUS', 'Executable?');

templates/2k11/admin/installer.inc.tpl

@@ -210,11 +210,11 @@
                 {/if}
 
                 <table>
-                    <caption>Executables</caption> {* i18n *}
+                    <caption>{$CONST.INSTALLER_CLI_TOOLS}</caption>
                     <thead>
                         <tr>
-                            <th>Program</th>  {* i18n *}
-                            <th>Executable?</th> {* i18n *}
+                            <th>{$CONST.INSTALLER_CLI_TOOLNAME}</th>
+                            <th>{$CONST.INSTALLER_CLI_TOOLSTATUS}</th>
                         </tr>
                     </thead>
                     <tbody>