IDLE: change new file name from ''Untitled" to "untitled"

BPO	35769
Nosy	@terryjreedy, @miss-islington
PRs	bpo-35769: Change IDLE's new file name from 'Untitled' to 'untitled' #11602 [3.7] bpo-35769: Change IDLE's name for new files from 'Untitled' to 'untitled' (GH-11602) #11603

^{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 = 'https://github.com/terryjreedy'
closed_at = <Date 2019-01-29.15:52:23.272>
created_at = <Date 2019-01-18.06:19:06.627>
labels = ['3.8', 'expert-IDLE', 'type-feature', '3.7']
title = 'IDLE: change new file name from  \'\'Untitled" to "untitled"'
updated_at = <Date 2019-01-29.15:52:23.271>
user = 'https://github.com/terryjreedy'

bugs.python.org fields:

activity = <Date 2019-01-29.15:52:23.271>
actor = 'cheryl.sabella'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2019-01-29.15:52:23.272>
closer = 'cheryl.sabella'
components = ['IDLE']
creation = <Date 2019-01-18.06:19:06.627>
creator = 'terry.reedy'
dependencies = []
files = []
hgrepos = []
issue_num = 35769
keywords = ['patch', 'patch']
message_count = 3.0
messages = ['333943', '333948', '333949']
nosy_count = 2.0
nosy_names = ['terry.reedy', 'miss-islington']
pr_nums = ['11602', '11603']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue35769'
versions = ['Python 3.7', 'Python 3.8']