about.js: small adaptions to the license text

to reflect https://www.gnu.org/licenses/agpl-3.0.html#howto

lib/about.js

@@ -20,10 +20,10 @@ define(function () {
       s += "<p>This program is distributed in the hope that it will be useful, "
       s += "but WITHOUT ANY WARRANTY; without even the implied warranty of "
       s += "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the "
-      s += "GNU General Public License for more details.</p>"
+      s += "GNU Affero General Public License for more details.</p>"
 
       s += "<p>You should have received a copy of the GNU Affero General "
-      s += "Public License long with this program. If not, see "
+      s += "Public License along with this program. If not, see "
       s += "<a href=\"https://www.gnu.org/licenses/\">"
       s += "https://www.gnu.org/licenses/</a>.</p>"