Prepare release 0.8.23

Author: bmarty

CHANGES.rst

@@ -1,4 +1,4 @@
-Changes in Riot 0.8.23 (2019-XX-XX)
+Changes in Riot 0.8.23 (2019-02-21)
 ===================================================
 
 MatrixSdk:
@@ -23,12 +23,6 @@ Bugfix:
  - Fix key backup banner doesn't go away after you have restored from backup. (#2943)
  - Fix issue with registration on some HomeServer (#2985)
 
-Translations:
- -
-
-Build:
- -
-
 Changes in Riot 0.8.22 (2019-02-01)
 ===================================================
 

build.gradle

@@ -24,7 +24,7 @@ buildscript {
 // global properties used in sub modules
 ext {
     versionCodeProp = 82300
-    versionNameProp = "0.8.23-dev"
+    versionNameProp = "0.8.23"
     versionBuild = System.getenv("BUILD_NUMBER") as Integer ?: 0
     buildNumberProp = "${versionBuild}"
 }