Rename /forget_password url to /forgot_password

Also renames `forgot_password` translation key to
`forgot_password_title` and `forget_password` to
`forgot_password`

Includes entry in CHANGELOG about the breaking change
(and some markdown fixes in there)

templates/user/auth/signin_inner.tmpl

@@ -31,7 +31,7 @@
 					<div class="inline field">
 						<label></label>
 						<button class="ui green button">{{.i18n.Tr "sign_in"}}</button>
-						<a href="{{AppSubUrl}}/user/forget_password">{{.i18n.Tr "auth.forget_password"}}</a>
+						<a href="{{AppSubUrl}}/user/forgot_password">{{.i18n.Tr "auth.forgot_password"}}</a>
 					</div>
 
 					{{if .ShowRegistrationButton}}
@@ -54,4 +54,4 @@
 			</form>
 		</div>
 	</div>
-</div>
+</div>