Filter search input is not aligned to left when the hint text is longer than the search input

Look at the alignment of the filter text box:

When we enable the pseudo localization, the search bar is not aligned to right anymore. This is because the hint message below is longer than the search box and that's making the search box to slide left a bit. We should still make the search input aligned to right even the hint text is longer than the search input itself.

Adding i18n label even though it's not completely relevant to i18n. It still affects the UI when another language is selected.

┆Issue is synchronized with this [Jira Task](https://mozilla-hub.atlassian.net/browse/FP-373)