[geary] RTL UI fixes for ConversationMessage.

[Michael Gratton <mjog src gnome org>]

commit cba778d6f78a632a9f06cfe26a5ecb18963db9c3
Author: Michael James Gratton <mike vee net>
Date:   Mon Dec 11 21:42:55 2017 +1100

    RTL UI fixes for ConversationMessage.

 ui/geary.css |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)
---
diff --git a/ui/geary.css b/ui/geary.css
index d92ca39..8508a7a 100644
--- a/ui/geary.css
+++ b/ui/geary.css
@@ -113,9 +113,12 @@ grid.geary-message-summary {
   margin: 0;
   padding: 1px;
 }
-.geary-headers label.geary-header {
+.geary-headers label.geary-header:dir(ltr) {
   padding-right: 6px;
 }
+.geary-headers label.geary-header:dir(rtl) {
+  padding-left: 6px;
+}
 .geary-headers flowboxchild {
   margin: 0;
   padding: 1px;
@@ -137,9 +140,13 @@ grid.geary-message-summary {
   background: @theme_base_color;
 }
 
-.geary-header-value > flowboxchild label.dim-label {
+.geary-header-value > flowboxchild label.dim-label:dir(ltr) {
   margin-left: 6px;
 }
+.geary-header-value > flowboxchild label.dim-label:dir(rtl) {
+  margin-right: 6px;
+}
+
 
 .geary-submessages .geary-message {
   background-image: linear-gradient(rgba(0,0,0,0.2), @bg_color 6px);