Search should ignore hotkey symbols

Qt (and some other UI toolkits) allow the developers and translators to specify mnemonics in action labels with an ampersand in front of the shortcut key.

For example, "G&o" for a menu label means that "o" can be used to select the menu with the keyboard. Unfortunately, the search for the string "Go" in Weblate does not find this label, which makes it very hard to search for such a string in the source or target strings unless you also remember what the shortcut was.

It would be useful if Weblate would ignore ampersands during searches like Qt Linguist does.