v2019.4: Release notes

Rendered here: https://em.pages.apertis.org/apertis-website/

Links are broken, so here are the pages involved:

• https://em.pages.apertis.org/apertis-website/release/v2019.4/releasenotes/
• https://em.pages.apertis.org/apertis-website/release/v2019.5/release_schedule/
• https://em.pages.apertis.org/apertis-website/policies/releases/

content/policies/releases.md

@@ -49,16 +49,17 @@ The latest releases are:
 
   - v2021dev2: [release notes]( {{< ref "/release/v2021dev2/releasenotes.md" >}} ), [release schedule]( {{< ref "/release/v2021dev2/release_schedule.md" >}} )
   - v2020.1: [release notes]( {{< ref "/release/v2020.1/releasenotes.md" >}} ), [release schedule]( {{< ref "/release/v2020.1/release_schedule.md" >}} )
-  - v2019.3: [release notes]( {{< ref "/release/v2019.3/releasenotes.md" >}} ), [release schedule]( {{< ref "/release/v2019.3/release_schedule.md" >}} )
+  - v2019.4: [release notes]( {{< ref "/release/v2019.4/releasenotes.md" >}} ), [release schedule]( {{< ref "/release/v2019.4/release_schedule.md" >}} )
 
 The next releases will be:
 
   - v2021dev3: [release schedule]( {{< ref "/release/v2021dev3/release_schedule.md" >}} )
   - v2020.2: [release schedule]( {{< ref "/release/v2020.2/release_schedule.md" >}} )
-  - v2019.4: [release schedule]( {{< ref "/release/v2019.4/release_schedule.md" >}} )
+  - v2019.5: [release schedule]( {{< ref "/release/v2019.5/release_schedule.md" >}} )
 
 For previous releases see:
 
+  - v2019.3: [release notes]( {{< ref "/release/v2019.3/releasenotes.md" >}} ), [release schedule]( {{< ref "/release/v2019.3/release_schedule.md" >}} )
   - v2021dev1: [release notes]( {{< ref "/release/v2021dev1/releasenotes.md" >}} ), [release schedule]( {{< ref "/release/v2021dev1/release_schedule.md" >}} )
   - v2020.0: [release notes]( {{< ref "/release/v2020.0/releasenotes.md" >}} ), [release schedule]( {{< ref "/release/v2020.0/release_schedule.md" >}} )
   - v2019.2: [release notes]( {{< ref "/release/v2019.2/releasenotes.md" >}} ), [release schedule]( {{< ref "/release/v2019.2/release_schedule.md" >}} )