Merge pull request #393 from ESMValGroup/remove_Julia_references

Remove Julia references as it is no longer supported

Author: LisaBock

_episodes/02-installation.md

@@ -109,7 +109,7 @@ see [the mamba installation documentation](https://docs.esmvaltool.org/en
 ### Install the ESMValTool package
 
 The ESMValTool package contains diagnostics scripts in four languages: R,
-Python, Julia and NCL. This introduces a lot of dependencies, and therefore the
+Python and NCL. This introduces a lot of dependencies, and therefore the
 installation can take quite long. It is, however, possible to install
 'subpackages' for each of the languages. The following (sub)packages are
 available:
@@ -126,7 +126,7 @@ ESMValTool package, run
 mamba create --name esmvaltool esmvaltool 
 ```
 
-On MacOSX ESMValTool functionalities in Julia, NCL, and R are not supported. To install
+On MacOSX ESMValTool functionalities in  NCL, and R are not supported. To install
 a Mamba environment on MacOSX, please refer to specific [information](https://
 docs.esmvaltool.org/en/latest/quickstart/installation.html#installation-on-
 macosx).

_episodes/08-diagnostics.md

@@ -27,7 +27,7 @@ The diagnostic script is an important component of ESMValTool and it is where th
 scientific analysis or performance metric is implemented. With ESMValTool, you
 can adapt an existing diagnostic or write a new script from scratch.
 Diagnostics can be written in a number of open source
-languages such as Python, R, Julia and NCL but we will focus on understanding
+languages such as Python, R and NCL but we will focus on understanding
 and writing Python diagnostics in this lesson.
 
 In this lesson, we will explain how to find an existing diagnostic and run it