Docs: On non-public translations, language picker fallback to "English"

[JulienPalard]

BPO	31146
Nosy	@ned-deily, @JulienPalard, @miss-islington, @tirkarthi
PRs	bpo-31146: Don't fallback switcher to english on not-yet pusblished languages #10558 [3.7] bpo-31146: Don't fallback switcher to english on not-yet pusblished languages. (GH-10558) #10609 [3.6] bpo-31146: Don't fallback switcher to english on not-yet pusblished languages. (GH-10558) #10610 [2.7] bpo-31146: Don't fallback switcher to english on not-yet pusblished languages. (GH-10558) #10611

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2018-11-21.23:06:12.864>
created_at = <Date 2017-08-08.15:29:40.261>
labels = ['type-feature', '3.7', 'docs']
title = 'Docs: On non-public translations, language picker fallback to "English"'
updated_at = <Date 2018-11-21.23:06:12.863>
user = 'https://github.com/JulienPalard'

bugs.python.org fields:

activity = <Date 2018-11-21.23:06:12.863>
actor = 'mdk'
assignee = 'docs@python'
closed = True
closed_date = <Date 2018-11-21.23:06:12.864>
closer = 'mdk'
components = ['Documentation']
creation = <Date 2017-08-08.15:29:40.261>
creator = 'mdk'
dependencies = []
files = []
hgrepos = []
issue_num = 31146
keywords = ['patch']
message_count = 5.0
messages = ['299932', '330134', '330222', '330223', '330224']
nosy_count = 5.0
nosy_names = ['ned.deily', 'docs@python', 'mdk', 'miss-islington', 'xtreak']
pr_nums = ['10558', '10609', '10610', '10611']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue31146'
versions = ['Python 2.7', 'Python 3.6', 'Python 3.7']

[JulienPalard]

As, by default, "english" is selected, and as we're building translations far before rendering them public by adding them to the language switcher, there's a timespan where a human can voluntarily land on a translation with a language switcher unaware of this language.

The language switcher currently defaults to english, so english is selected. As "english" is already selected, one can't select "english" to navigate to the english version.

Solutions may be to just hide the select element on unknown translations, or display the unknown language tag. With more work and a "predicted" list of tags-names, it may be possible to also display the name of the language.

Code is here: https://github.com/python/cpython/blob/master/Doc/tools/static/switchers.js

I'll take a look, but if some want to do it, let me know.

[JulienPalard]

New changeset 6b73bb5 by Julien Palard in branch 'master':
bpo-31146: Don't fallback switcher to english on not-yet pusblished languages. (GH-10558)
6b73bb5

[miss-islington]

New changeset df6374e by Miss Islington (bot) in branch '3.7':
bpo-31146: Don't fallback switcher to english on not-yet pusblished languages. (GH-10558)
df6374e

[miss-islington]

New changeset c487cf9 by Miss Islington (bot) in branch '3.6':
bpo-31146: Don't fallback switcher to english on not-yet pusblished languages. (GH-10558)
c487cf9

[miss-islington]

New changeset fcbceba by Miss Islington (bot) in branch '2.7':
bpo-31146: Don't fallback switcher to english on not-yet pusblished languages. (GH-10558)
fcbceba