Update NEWS

NEWS

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+15.0.20180514
+- Updated Makefile
+- Updated translations (Arabic, Catalan, Chinese (China), Chinese
+  (Taiwan), Czech, Danish, Dutch, Finnish, French, Galician, German,
+  Greek, Hindi, Indonesian, Italian, Japanese, Polish, Portuguese
+  (Brazil), Russian, Slovak, Spanish, Swedish, Turkish, Ukrainian)
+- Added note about changing login manager/session (boo#1091021)
+- Added note about Postfix Admin directory structure (boo#1091866)
+- Improve section about minimal systems (boo#1092056)
+- Added note about Plasma browser integration (boo#1092494)
+- Added note about Screen Sharing on Wayland (boo#1086433)
+- Added note about KDE on Wayland and Nvidia driver (boo#1090382)
+- Added entries about High-DPI in YaST, SDDM (boo#1090240,
+  boo#1083873)
+- Added note about font rendering change (boo#1085372)
+- firewalld replaces SuSEfirewall2 (boo#1090358)
+- Added note on Emacs psgml module (boo#1080086)
+
+
 15.0.20180214
 - Updated Makefile
   - Use itstool instead of xml2po (to get rid of Python 2 deps)