Steps to reproduce:

In multiple forms, widgets and filters layout is broken, when long names are used.
The places in which long names are not supported are:

• Configuration -> Hosts -> Graphs and Graph prototypes item list;
• Trigger and Trigger prototype selection popup;
• Host group selection popup;
• Template group selection popup;
• User selection popup;
• User role selection popup;
• Users -> Media (long type names);
• Users -> Permissions;
• User groups -> Permissions hosts/templates/tag filters;
• Discovered host edit and popup doesn't support long "Discovered by" names;
• Action selection popup (dashboard action log widget);
• Latest data sub-filter with long tag names and values;
• Modern graph widget multiselects don't support long host and item names;
• Widget selection popup;
• Services -> Info;
• SLA selection (it's in SLA report page or SLA report widget) popup;
• Top triggers widget long trigger names;
• Top 100 triggers with long host names and trigger names;
• Dashboard sharing popup doesn't support user names with long names and last names;
• Proxy group selection popup;
• API Tokens (edit popup);
• Dashboard selection popup (in scheduled reports);
• Inventory -> Hosts -> Details;
• Event details actions block with long recipient names/problem names/messages break UI;
• Monitoring -> Map trigger element -> trigger list;
• Action operations;
• Action -> Operations popup -> send to users table;
• Monitoring -> Hosts -> web single view with steps (status message is cut off);
• Script execution popup (for example when script failed to execute) title;
• Plain text widget non-HTML version value column can have units and if unit names are very long in column is unreadable, and HTML plain text version units with long names stretch wide;
•  Configuration items trigger link mouse over popup;
• Modern graph widget (when mouse is over problems)-> hint popup box that follows the mouse is displayed on far left side of the screen (Long names don't fit in it);
• Administration -> Regular expressions -> Test form breaks UI.
• Modern graph widget -> Add new data set -> Item list -> item with long name doesn't fit
• Discovery rule name
• Host->Discovery->Create Discovery rule ->Overrides
• Host - Discovery - Discovery prototypes
• Scripts
• User groups -> problem tag filter
  
• Proxy group in host view
  

It is possible that there are more.

Result:
A few examples:

Graph edit:

Graph edit (zoom 125%):

SLA report->SLA multiselect:

Users->User groups->edit->User multiselect:

Host->Discovery->Create new discovery rule

Overrides:

Discovery prototypes

Expected:
Long names do not break the layout.