Fix (and improve) sphinx-lint log (#114)

Correct warning file path as so that the updated files are committed.
Improve logs by removing unrelated file paths, decreasing line length.

Co-authored-by: Maciej Olko <[email protected]>

Author: StanFromIreland

sphinx_lint.py

@@ -7,8 +7,12 @@
 
 def store_and_count_failures(clones_dir: str, repo: str, language_code: str) -> int:
     failed_checks = list(chain.from_iterable(yield_failures(clones_dir, repo)))
-    filepath = Path(f'warnings-lint-{language_code}.txt')
-    filepath.write_text('\n'.join([str(c) for c in failed_checks]))
+    prefix = f'{Path(clones_dir, "rebased_translations", repo)}/'
+    log = '\n'.join(
+        map(lambda check: check.removeprefix(prefix), map(str, failed_checks))
+    )
+    filepath = Path(f'build/warnings-lint-{language_code}.txt')
+    filepath.write_text(log)
     return len(failed_checks)