Bump devise-i18n from 1.14.0 to 1.15.0 (#1055)

Bumps [devise-i18n](https://github.com/devise-i18n/devise-i18n) from
1.14.0 to 1.15.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/devise-i18n/devise-i18n/releases">devise-i18n's
releases</a>.</em></p>
<blockquote>
<h2>v1.15.0</h2>
<ul>
<li>Fixed an issue where pluralization was broken in certain languages
like Japanese if the app didn't require <code>rails_i18n</code>.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/devise-i18n/devise-i18n/blob/master/CHANGELOG.md">devise-i18n's
changelog</a>.</em></p>
<blockquote>
<h2>1.15.0</h2>
<ul>
<li>Fixed an issue where pluralization was broken in certain languages
like Japanese if the app didn't require <code>rails_i18n</code>.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/devise-i18n/devise-i18n/commit/919c4ad4dd9b748544a023b5ff3af74c22b2ae67"><code>919c4ad</code></a>
Prepare for 1.15.0</li>
<li><a
href="https://github.com/devise-i18n/devise-i18n/commit/8d2a8342ac852832389383822c828d8b8f3e999e"><code>8d2a834</code></a>
require 'rails_i18n' in railtie.rb (<a
href="https://redirect.github.com/devise-i18n/devise-i18n/issues/29">#29</a>)</li>
<li>See full diff in <a
href="https://github.com/devise-i18n/devise-i18n/compare/v1.14.0...v1.15.0">compare
view</a></li>
</ul>
</details>
<br />


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</details>

Author: rsmithlal

Gemfile.lock

@@ -262,7 +262,7 @@ GEM
       railties (>= 4.1.0)
       responders
       warden (~> 1.2.3)
-    devise-i18n (1.14.0)
+    devise-i18n (1.15.0)
       devise (>= 4.9.0)
       rails-i18n
     devise-jwt (0.12.1)