browser: Normalize encodings

Sometimes it is lowercase, uppercase, or even bytes instead of unicode
strings!
This removes a warning under Python 3.
12 jobs for master in 5 minutes and 19 seconds (queued for 48 minutes and 44 seconds)
Status Job ID Name Coverage
  Build
failed #24494
build:2.7

00:02:45

failed #24495
build:3

00:02:34

 
  Test
skipped #24497
allowed to fail
lint:2.7
skipped #24501
allowed to fail
lint:3
skipped #24496
pyflakes:2.7
skipped #24500
pyflakes:3
skipped #24498
unittests:2.7
skipped #24502
unittests:3
skipped #24499
allowed to fail
unittests-modules:2.7
skipped #24503
allowed to fail
unittests-modules:3
 
  Deploy
skipped #24504
doc:2.7
skipped #24505
doc:3
 
Name Stage Failure
failed
build:3 Build

Installing weboob applications into ‘/root/bin’.
Traceback (most recent call last):
File "./tools/local_install.py", line 30, in <module>
subprocess.check_call([sys.executable, os.path.join(dest, 'weboob-config'), 'update'])
File "/usr/local/lib/python3.8/subprocess.py", line 364, in check_call
raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['/usr/local/bin/python3', '/root/bin/weboob-config', 'update']' returned non-zero exit status 130.
ERROR: Job failed: exit code 1
failed
build:2.7 Build
 * [new tag]         1.3        -> 1.3
* [new tag] 1.4 -> 1.4
* [new tag] 1.5 -> 1.5
Checking out 490bcb05 as master...

Skipping Git submodules setup
$ pip3 install -r .ci/requirements.txt
/bin/bash: line 82: pip3: command not found
ERROR: Job failed: exit code 1