Tidy up some text around logins and proposals

app/views/proposals/_encouragement_text.html.haml

@@ -7,7 +7,7 @@
     = "#{pluralize(@program.tracks.confirmed.cfp_active.count, 'track')}:"
     = "#{tracks(@conference)}."
   - if @program.cfp_open?
-    The submission period has begun
+    The submission period is open from
     %em.notranslate
       = @program.cfp.start_date.strftime('%A, %B %-d. %Y')
     and closes
@@ -16,9 +16,7 @@
     That means you have
     %b.notranslate= pluralize(@program.cfp.remaining_days, 'day')
     left!
-    Remember
-    %span.notranslate
-      = @conference.title
+    %span.notranslate #{@conference.title}
     will only be as good as the content you present. Submit early, submit often!
-  -else
+  - else
     The submission period is closed now.