Implement translation hints in PHP

[vitormattos]

Following the pattern described in Nextcloud developer manual, PHP codes that do translations could have hints to help translators to understand the context of sentence to translate.

Example:

<ul id="translations">
    <li id="add-new">
        <?php
            // TRANSLATORS Will be shown inside a popup and asks the user to add a new file
            p($l->t('Add new file'));
        ?>
    </li>
</ul>

Suggestion:
Now we have a lot of sentences to put hint. To don't have a very big pull request, do small pull requests, maybe maximum implementing 10 hints.

Using the follow command, you can found the total of rows with translation method in PHP code.

grep -Rn -e "->t(" lib/ | wc -l

To see all the rows, remove | wc -l

[AntDavidLima]

Hello, I'm applying to Libre Code and would like to start contributing with this repo.

Sinse this issue looks to be one of the simplest one open and is marked as a good first issue, I thing it would be a good start point to get to know the code base.

May I do this task?