don't require :environment for i18n:check
don't require :environment for i18n:check

refs https://trello.com/c/Ls5yeXt4/40

reduces wall time ~20 sec (when not using spring)

test plan:
1. change your database.yml to have a bogus db
2. `rake i18n:check` should not give you a db error
3. `rake i18n:generate` should produce the same yml as before
4. they both should start up about 20 sec faster \o/

Change-Id: I1f13b350f3ccc4d9b572514b5cdaee2f35c02ce4
Reviewed-on: https://gerrit.instructure.com/43887
Product-Review: Jennifer Stern <7e594e5cba47371ac9ee694a84b9d94f9f6ec815@instructure.com>
Reviewed-by: Jennifer Stern <7e594e5cba47371ac9ee694a84b9d94f9f6ec815@instructure.com>
QA-Review: Jennifer Stern <7e594e5cba47371ac9ee694a84b9d94f9f6ec815@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>

juoni/canvas-lms,narigone/canvas,HotChalk/canvas-lms,tgroshon/canvas-lms,sfu/canvas-lms,dgynn/canvas-lms,HotChalk/canvas-lms,skmezanul/canvas-lms,matematikk-mooc/canvas-lms,jay3126/canvas-lms,wrdsb/canvas-lms,jay3126/canvas-lms,wrdsb/canvas-lms,djbender/canvas-lms,kyroskoh/canvas-lms,SwinburneOnline/canvas-lms,tgroshon/canvas-lms,fronteerio/canvas-lms,leftplusrightllc/canvas-lms,ShreniiNepal/shrenii_lmp,ShreniiNepal/shrenii_lmp,grahamb/canvas-lms,skmezanul/canvas-lms,grahamb/canvas-lms,skmezanul/canvas-lms,redconfetti/canvas-lms,kyroskoh/canvas-lms,AndranikMarkosyan/lms,leftplusrightllc/canvas-lms,Rvor/canvas-lms,snehakachroo1/LSI_replica,greyhwndz/canvas-lms,djbender/canvas-lms,venturehive/canvas-lms,djbender/canvas-lms,antoniuslin/canvas-lms,instructure/canvas-lms,sdeleon28/canvas-lms,narigone/canvas,fronteerio/canvas-lms,sfu/canvas-lms,dgynn/canvas-lms,efrj/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,AndranikMarkosyan/lms,efrj/canvas-lms,sdeleon28/canvas-lms,efrj/canvas-lms,Rvor/canvas-lms,antoniuslin/canvas-lms,SwinburneOnline/canvas-lms,antoniuslin/canvas-lms,eCNAP/CANVAS,Jyaasa/canvas-lms,wrdsb/canvas-lms,samuels410/greatlakes-lms,utkarshx/canvas-lms,leftplusrightllc/canvas-lms,jay3126/canvas-lms,sfu/canvas-lms,matematikk-mooc/canvas-lms,snehakachroo1/LSI_replica,eCNAP/CANVAS,tgroshon/canvas-lms,whalejasmine/canvas-lms,grahamb/canvas-lms,SwinburneOnline/canvas-lms,utkarshx/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,juoni/canvas-lms,HotChalk/canvas-lms,instructure/canvas-lms,kyroskoh/canvas-lms,snehakachroo1/LSI_replica,juoni/canvas-lms,samuels410/greatlakes-lms,narigone/canvas,dgynn/canvas-lms,fronteerio/canvas-lms,Jyaasa/canvas-lms,whalejasmine/canvas-lms,djbender/canvas-lms,jay3126/canvas-lms,shidao-fm/canvas-lms,samuels410/greatlakes-lms,dgynn/canvas-lms,eCNAP/CANVAS,roxolan/canvas-lms,va7map/canvas-lms,grahamb/canvas-lms,sfu/canvas-lms,juoni/canvas-lms,antoniuslin/canvas-lms,AndranikMarkosyan/lms,ShreniiNepal/shrenii_lmp,roxolan/canvas-lms,shidao-fm/canvas-lms,greyhwndz/canvas-lms,efrj/canvas-lms,instructure/canvas-lms,Jyaasa/canvas-lms,sdeleon28/canvas-lms,fronteerio/canvas-lms,instructure/canvas-lms,venturehive/canvas-lms,greyhwndz/canvas-lms,HotChalk/canvas-lms,shidao-fm/canvas-lms,ShreniiNepal/shrenii_lmp,utkarshx/canvas-lms,redconfetti/canvas-lms,kyroskoh/canvas-lms,snehakachroo1/LSI_replica,sdeleon28/canvas-lms,greyhwndz/canvas-lms,va7map/canvas-lms,wrdsb/canvas-lms,venturehive/canvas-lms,skmezanul/canvas-lms,whalejasmine/canvas-lms,shidao-fm/canvas-lms,Rvor/canvas-lms,sfu/canvas-lms,va7map/canvas-lms,venturehive/canvas-lms,grahamb/canvas-lms,matematikk-mooc/canvas-lms,Rvor/canvas-lms,eCNAP/CANVAS,redconfetti/canvas-lms,AndranikMarkosyan/lms,narigone/canvas,roxolan/canvas-lms,matematikk-mooc/canvas-lms,leftplusrightllc/canvas-lms,SwinburneOnline/canvas-lms,tgroshon/canvas-lms,whalejasmine/canvas-lms,va7map/canvas-lms,instructure/canvas-lms,utkarshx/canvas-lms,roxolan/canvas-lms,Jyaasa/canvas-lms,redconfetti/canvas-lms,samuels410/greatlakes-lms