Changed language keys for entities and triggers

Placement and attribute keys are now at
  entities.entityName.placements.name.*
  entities.entityName.placements.description.*
  entities.entityName.attributes.name.*
  entities.entityName.attributes.description.*
This is more consistent with language keys in the project with tools for example
Also more obvious what "description" belongs to, is it the placement tooltip or the attribute tooltip?

src/entities.lua

@@ -743,8 +743,8 @@ local function getPlacement(placementInfo, defaultPlacement, name, handler, lang
     local simpleName = string.format("%s#%s", name, placementInfo.name)
     local displayName = placementInfo.name
     local tooltipText
-    local displayNameLanguage = language.entities[name].name[placementInfo.name]
-    local tooltipTextLanguage = language.entities[name].description[placementInfo.name]
+    local displayNameLanguage = language.entities[name].placements.name[placementInfo.name]
+    local tooltipTextLanguage = language.entities[name].placements.description[placementInfo.name]
 
     if displayNameLanguage._exists then
         displayName = tostring(displayNameLanguage)