Rename the color tags "Filters" tab and column to "Pattern" (FR: "Motif de recherche")

Only the color highlight rules are renamed: the Settings tab, the codes
column of the log list and the docs. Real filters (source, severity,
range, search) keep their name. The internal "filters" tab id is kept so
the saved settings tab still opens.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

README.md

@@ -307,7 +307,7 @@ remembered per browser.
     format of the reception time: `DD/MM/YYYY HH:MM:SS` (default, the usual French display),
     with milliseconds, `YYYY-MM-DD`, 12-hour clock, ISO 8601 or Unix epoch. The time zone
     applies to every date shown.
-- **Filters**: color tags. Each tag has a keyword, a background color (the text automatically
+- **Pattern**: color tags. Each tag has a keyword, a background color (the text automatically
   switches to black or white to stay readable) and options: whole word, match case,
   regular expression, active. Tags are stored on the server in `/data/tags.json`
   (`logstream-data` volume), so they are shared by every browser. Default tags (pastel):
@@ -324,7 +324,7 @@ remembered per browser.
   or the method, not the text around it.
   Each tag gets a two-digit code (`01`, `02`…) assigned by the server: it stays with the tag
   until the tag is deleted (codes are also given to tags created by earlier versions). The
-  *Filters* column of the log list shows, as grey badges, the codes of the active tags found in
+  *Pattern* column of the log list shows, as grey badges, the codes of the active tags found in
   each message; it has room for 3, beyond that it shows 2 and `+N`, and the tooltip lists them
   all.
 - **Interface**