anaconda: update message about unusupported hardware

Advise to not continue.

Fixes QubesOS/qubes-issues#3208

anaconda/pyanaconda/ui/gui/spokes/welcome.glade

@@ -507,7 +507,7 @@
                 <property name="visible">True</property>
                 <property name="can_focus">False</property>
                 <property name="valign">start</property>
-                <property name="label" translatable="yes">This hardware lack features required by Qubes OS. Missing features: %(features)s. For more information on supported hardware, please refer to https://www.qubes-os.org/system-requirements/</property>
+                <property name="label" translatable="yes">This hardware lacks features required by Qubes OS. Missing features: %(features)s. Without these features, Qubes OS will not function normally. It is recommended that only developers and power users proceed with the installation. For more information on supported hardware, please refer to https://www.qubes-os.org/system-requirements/</property>
                 <property name="wrap">True</property>
                 <attributes>
                   <attribute name="font-desc" value="Cantarell 12"/>