Bug 1614998 - Change treeherder representation for L10n to be 'B' and 'Bs' instead of 'N' and 'Ns' r=aki

Differential Revision: https://phabricator.services.mozilla.com/D62640

--HG--
extra : moz-landing-system : lando

taskcluster/ci/shippable-l10n/kind.yml

@@ -118,7 +118,7 @@ job-template:
             default: b-linux
             win.*: b-win2012
     treeherder:
-        symbol: L10n(N)
+        symbol: L10n(B)
         tier:
             by-build-platform:
                 default: 1

taskcluster/taskgraph/transforms/nightly_l10n_signing.py

@@ -23,7 +23,7 @@ def make_signing_description(config, jobs):
         dep_job = job['primary-dependency']
 
         # add the chunk number to the TH symbol
-        symbol = 'Ns{}'.format(dep_job.attributes.get('l10n_chunk'))
+        symbol = 'Bs{}'.format(dep_job.attributes.get('l10n_chunk'))
         group = 'L10n'
 
         job['treeherder'] = {