fix(locale): complete and correct romanian translations

[vicuts]

Description

Some strings in the Romanian locale (ro.ts) were still in English, and a few others did not match what the English string says. This PR translates the missing ones and fixes the rest.

Key	English	Before	After
open	Open	Open	Deschideți
dismiss	Dismiss	Dismiss	Închideți
calendar.today	Today	Today	Astăzi
timePicker.minute	Minute	Minute	Minut
timePicker.second	Second	Secunde	Secundă
rules.exclude	The {0} character is not allowed	Caracterele {0} nu sunt permise	Caracterul {0} nu este permis
hotkey.shortcut	Keyboard shortcut: {0}	Comandă rapidă tastatură: {0}	Comandă rapidă de la tastatură: {0}

Notes:

• open uses the same form as the existing close: 'Închideți', since the two are the open/close labels of the menu toggle.
• dismiss is the default button text of VSnackbarQueue. "Închideți" is the usual Romanian label for dismissing a notification.
• calendar.today matches the existing datePicker.ariaLabel.currentDate: 'Astăzi, {0}'.
• timePicker.minute and timePicker.second are field labels. "Minute" and "Secunde" are plural in Romanian, so they now use the singular, like hour: 'Oră' and like English.
• rules.exclude always receives a single character (see composables/rules/rules.ts), so the message is now singular.
• hotkey.shortcut was missing the preposition. "Comandă rapidă de la tastatură" is the standard Romanian term.

Left as is on purpose: confirmEdit.ok, timePicker.am, timePicker.pm and the key names in hotkey (Ctrl, Command, Shift, Alt, Option, Enter, Escape, Backspace, plus) are the same as in English, which is what Romanian keyboards and UIs use.

Checked that ro.ts still has the same 137 keys as en.ts, that every {0} and {1} placeholder is kept, and that tsc --noEmit passes on the file.

Markup:

Open the playground with ?locale=ro (for example http://localhost:8090/?locale=ro).

<template>
  <v-app>
    <v-container>
      <v-autocomplete :items="['Unu', 'Doi']" label="Autocomplete" />

      <v-time-picker variant="input" use-seconds />

      <v-hotkey keys="ctrl+k" />

      <v-btn @click="messages.push('Mesaj salvat')">Show snackbar</v-btn>

      <v-snackbar-queue v-model="messages" closable />
    </v-container>
  </v-app>
</template>

<script>
  import { ref } from 'vue'

  export default {
    name: 'Playground',
    setup () {
      const messages = ref([])

      return { messages }
    },
  }
</script>