String encapsulation for improved translation

@chrox
Incidentally, does the same potential confusion exist for, say, square brackets (`[]`)?

@thotypous 
Would it be fair to extract from your message that you think the syntax should be compatible with something that already exists? You'd have, for example:
## Existing (Flexible)
Python (probably still my preference):
```python
"page {page_number}"
```
Perl/PHP/shell (not bad, especially the more explicit `${variable}`):
```php
"page $page_number or ${page_number}"
```
Also PHP, argument swapping (undesirably complex):
```php
sprintf('page %2$d of %1$d pages', $total_pages, $current_page)
```
Qt (a bit cryptic; in Perl etc. you also have `$1`, `$2` to the same effect):
```c
"page %1"
```
## From Scratch
Python-esque (more natural; could it be crossing over into *too* natural?; no literal precedent afaik):
```lua
"page {page number}"
```