Brand the webmail INBUXA: name, mark and wordmark

INBUXA is a product suite and ihasmail an independent product, so INBUXA's
webmail says INBUXA: the sign-in page, header, page title, installed-app name
and About page. The wordmark is drawn in the current text color. ihasmail's
version and AGPL source line stay as its credit. Two new strings, in all nine
catalogues; three Stalwart-only ones are no longer used.

web/public/manifest.webmanifest

@@ -1,7 +1,7 @@
 {
-  "name": "ihasmail",
-  "short_name": "ihasmail",
-  "description": "Fast, friendly JMAP webmail for Stalwart",
+  "name": "INBUXA",
+  "short_name": "INBUXA",
+  "description": "INBUXA webmail",
   "_comment": "JSON has no comments, so: every URL below is relative on purpose. Manifest members resolve against the manifest's own address, so these follow BASE_PATH with nothing substituted into them at build time. Root-absolute values pinned the installed app, its scope and its shortcuts to the domain root whatever the mount was.",
   "_comment_id": "There is deliberately no `id`. It is the one member NOT resolved against this file's address -- the spec resolves it against the origin of start_url, so `./`, `mail` and `/mail` all mean the same thing at the domain root and none of them can name a subpath mount. Adding one would therefore break the same thing the note above describes. Worse, the default id IS start_url, which is already mount-correct: writing an id now would give every installed copy a new identity and orphan it as a second app rather than updating it. If one is ever wanted it has to be substituted at build time from BASE_PATH, and the changeover costs everybody their install.",
   "start_url": "mail",