v3.30.1: the batch status modal cosmetics

The v3.30.0 review follow-up, both items cosmetic:

- The modal's title follows the run's kind, but a cleared report carries
  kind: null, so Clear flipped a delete/reinstall run to the install
  title.  The last seen kind is remembered (_ramBatchLastKind, set in
  ramBatchRender) and the title falls back to it through the new
  ramBatchModalTitle() helper.
- The two batch-state RU strings stopped being install-specific: 'Batch
  stopped'/'Batch finished' are now «Пакетная операция
  остановлена/завершена» (the v3.29.0 kinds can delete or reinstall),
  matching the help's own «Пакетная операция» wording.

Test: the cleared title keeps the kind and a fresh page keeps the
install default.  930 frontend + 945 Python; sw cache simple-v451.

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "pysim-simple-server"
-version = "3.30.0"
+version = "3.30.1"
 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.