Update the My first translation tutorial at https://documentation.magnolia-cms.com/display/DOCS/My+first+translation

Things to note:

• I (RS) tested the tutorial on 5.5
• magnolia-app-tutorial-1.4.6.jar is out of date and does not install on 5.5.
• magnolia-app-tutorial-1.4.7-SNAPSHOT works fine but field translations need an update (see attached screenshots for examples)
• in Special characters section verify that saving "with UTF-8 encoding" is enough. See instructions in https://documentation.magnolia-cms.com/display/DOCS/Language+configuration#Languageconfiguration-UTF-8pagenames
• in Test the translation section - 1 it should no longer be necessary to update resources 2 - tool in step 2 is no longer available in any event 3 - regarding the bullet point about using a local message bundle: the translations only displayed for me after a restart.