Add a translation to the captcha strings in the registration form

src/components/registration/registration.vue

@@ -76,12 +76,12 @@
             </div>
 
             <div class="form-group" id="captcha-group" v-if="captcha.type != 'none'">
-              <label class='form--label' for='captcha-label'>CAPTCHA</label>
+              <label class='form--label' for='captcha-label'>$t('captcha')</label>
 
               <template v-if="captcha.type == 'kocaptcha'">
                 <img v-bind:src="captcha.url" v-on:click="setCaptcha">
 
-                <sub>Click the image to get a new captcha</sub>
+                <sub>{{$t('registration.new_captcha')}}</sub>
 
                 <input :disabled="isPending"
                   v-model='captcha.solution'

src/i18n/en.json

@@ -74,6 +74,8 @@
     "password_confirm": "Password confirmation",
     "registration": "Registration",
     "token": "Invite token",
+    "captcha": "CAPTCHA",
+    "new_captcha": "Click the image to get a new captcha",
     "validations": {
       "username_required": "cannot be left blank",
       "fullname_required": "cannot be left blank",