Adjust the copy in the auth dialog to remove commas (#60)

Adjust the copy slightly in the auth dialog

This addresses https://github.com/felt/qgis-plugin-discussion/issues/25 by
removing commas that do not display correctly on MacOS.

felt/ui/authorize.ui

@@ -53,7 +53,7 @@
      <item>
       <widget class="QLabel" name="label_login">
        <property name="text">
-        <string>Share, collaborate, and mark up your maps quickly and beautifully on the web using Felt.
+        <string>Share and markup your maps quickly and beautifully on the web using Felt.
 
 Log in or sign up to get started - it’s free!</string>
        </property>