stats page few more items to be internationalized

[jmfrenzel]

Descriptive summary

replace hard coded English

• app/views/hyrax/admin/stats/_stats_by_date.html.erb
• app/views/hyrax/admin/stats/_new_users.html.erb
• app/views/hyrax/admin/stats/_deposits.html.erb
• app/views/hyrax/admin/stats/_top_data.html.erb
• app/presenters/hyrax/admin_stats_presenter.rb

Rationale

replace hard coded English to bee replaces by i18n internationalization

Expected behavior

get fully translated site (locale)

Actual behavior

Site is showing hard coded English independent selected language

Steps to reproduce the behavior

see eg. https://nurax.curationexperts.com/admin/stats?utf8=%E2%9C%93&locale=de&stats_filters%5Bstart_date%5D=2017-12-12&stats_filters%5Bend_date%5D=2018-02-02&commit=Load+Stats

Related work

samvera/hyrax#1386