ui: rename the SCP81 script templates to Explore ISD / Delete AID (v3.1.3)

'Explore' and 'Delete' were ambiguous next to the other SCP81 actions.

- template selector: Explore -> Explore ISD, Delete -> Delete AID (EN/RU);
- a new Explore script is named 'Explore ISD'; the Delete template keeps
  its count-based name (e.g. 'Delete 2 AIDs');
- new scriptKindLabel() maps the stored kinds (unchanged:
  explore/delete/install/empty, so existing localStorage scripts keep
  working) to those labels and is now used for the scripts table kind
  column, which used to print the raw lowercase kind untranslated;
- docs: help EN/RU, README/RUS, docs/api.md examples, AGENTS;
- sw.js simple-v238.

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "pysim-simple-server"
-version = "3.1.2"
+version = "3.1.3"
 description = "HTTP REST server wrapping pysim for the SIMple PWA"
 requires-python = ">=3.8"
 # pysim is a git-only dependency installed explicitly by setup.bat/setup.sh.