Allow users to set the trigger height for lengthy toot auto-collapse (#2070)

* Allow users to set the trigger height for lengthy toot autocollapse

Add a field in the glitch-soc preferences to set the exact height in pixels of a "lengthy toot" where auto-collapse is triggered

Originally authored by Dean Bassett (github.com/deanveloper)

Squashed 3 commits from neatchee/mastodon and returned some values to project defaults:
* ef665c1df5821e684c8da3392049f33243fafa74
* 0fce108d210efe55027a3af061bfc57aaaa83843
* 998f701a2b2e37edbda7dffb11a61f67f5559b18

* Remove bad escape characters

* Apply feedback from glitch-soc code review
- move input width specification to CSS
- adjust language for clarity

* Update comments re: lengthy toot height

* Fix inconsistent indentation

* Use a calculated width that scales better with browser font instead of static 45px width

app/javascript/flavours/glitch/locales/en.json

@@ -103,6 +103,7 @@
   "settings.auto_collapse_all": "Everything",
   "settings.auto_collapse_lengthy": "Lengthy toots",
   "settings.auto_collapse_media": "Toots with media",
+  "settings.auto_collapse_height": "Height (in pixels) for a toot to be considered lengthy",
   "settings.auto_collapse_notifications": "Notifications",
   "settings.auto_collapse_reblogs": "Boosts",
   "settings.auto_collapse_replies": "Replies",