Add a text to the show password link in management area

We were using an icon for this link, but people who can't see the icon
couldn't know what the link was about. Axe was reporting the following
accessibility error:

```
link-name: Links must have discernible text (serious)
https://dequeuniversity.com/rules/axe/4.10/link-name?application=axeAPI
The following 1 node violate this rule:

  Selector: .show-password
  HTML: <a href="#" class="show-password">
          <span class="icon-eye"></span>
        </a>
  Fix all of the following:
  - Element is in tab order and does not have accessible text
  Fix any of the following:
  - Element does not have text that is visible to screen readers
  - aria-label attribute does not exist or is empty
  - aria-labelledby attribute does not exist, references elements
    that do not exist or references elements that are empty
  - Element has no title attribute
```

app/components/management/account/edit_password_manually_component.html.erb

@@ -10,7 +10,10 @@
     <div class="input-group">
       <%= f.password_field :password, class: "input-group-field", label: false, value: nil %>
       <span class="input-group-label">
-        <a href="#" class="show-password"><span class="icon-eye"></span></a>
+        <a href="#" class="show-password">
+          <span class="icon-eye"></span>
+          <span class="show-for-sr"><%= t("management.account.edit.password.show") %></span>
+        </a>
       </span>
     </div>
 

config/locales/en/management.yml

@@ -18,6 +18,7 @@ en:
           reseted: Password reseted successfully
           random: Generate random password
           save: Save password
+          show: Show password
           print: Print password
           print_help: You will be able to print the password when it is saved.
     account_info:

config/locales/es/management.yml

@@ -18,6 +18,7 @@ es:
           reseted: Contraseña restablecida correctamente
           random: Generar contraseña aleatoria
           save: Guardar contraseña
+          show: Mostrar contraseña
           print: Imprimir contraseña
           print_help: Podrás imprimir la contraseña cuando se haya guardado.
     account_info:

spec/system/management/account_spec.rb

@@ -59,6 +59,16 @@ describe "Account" do
 
     new_password = find_field("user_password").value
 
+    expect(page).to have_field "Password", type: :password
+
+    click_link "Show password"
+
+    expect(page).to have_field "Password", type: :text
+
+    click_link "Show password"
+
+    expect(page).to have_field "Password", type: :password
+
     click_button "Save password"
 
     expect(page).to have_content "Password reseted successfully"